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class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Indhold</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">flyt til sidebjælken</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">skjul</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Indledning</div> </a> </li> <li id="toc-Historie" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Historie"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Historie</span> </div> </a> <ul id="toc-Historie-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Lysets_egenskaber" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Lysets_egenskaber"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Lysets egenskaber</span> </div> </a> <button aria-controls="toc-Lysets_egenskaber-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Vis/skjul underafsnit Lysets egenskaber</span> </button> <ul id="toc-Lysets_egenskaber-sublist" class="vector-toc-list"> <li id="toc-Hastighed" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Hastighed"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Hastighed</span> </div> </a> <ul id="toc-Hastighed-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Brydning" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Brydning"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2</span> <span>Brydning</span> </div> </a> <ul id="toc-Brydning-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Lys_som_sanseindtryk" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Lys_som_sanseindtryk"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Lys som sanseindtryk</span> </div> </a> <ul id="toc-Lys_som_sanseindtryk-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Lyskilder" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Lyskilder"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Lyskilder</span> </div> </a> <ul id="toc-Lyskilder-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Måling_af_lys" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Måling_af_lys"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Måling af lys</span> </div> </a> <ul id="toc-Måling_af_lys-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Se_også" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Se_også"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Se også</span> </div> </a> <ul id="toc-Se_også-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Noter" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Noter"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>Noter</span> </div> </a> <ul id="toc-Noter-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Eksterne_henvisninger" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Eksterne_henvisninger"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>Eksterne henvisninger</span> </div> </a> <ul id="toc-Eksterne_henvisninger-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Indhold" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Vis/skjul indholdsfortegnelsen" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Vis/skjul indholdsfortegnelsen</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Lys</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Gå til en artikel på et andet sprog. Tilgængelig på 180 sprog" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-180" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">180 sprog</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Lig" title="Lig – afrikaans" lang="af" hreflang="af" data-title="Lig" data-language-autonym="Afrikaans" data-language-local-name="afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-als mw-list-item"><a href="https://als.wikipedia.org/wiki/Licht" title="Licht – schweizertysk" lang="gsw" hreflang="gsw" data-title="Licht" data-language-autonym="Alemannisch" data-language-local-name="schweizertysk" class="interlanguage-link-target"><span>Alemannisch</span></a></li><li class="interlanguage-link interwiki-am mw-list-item"><a href="https://am.wikipedia.org/wiki/%E1%89%A5%E1%88%AD%E1%88%83%E1%8A%95" title="ብርሃን – amharisk" lang="am" hreflang="am" data-title="ብርሃን" data-language-autonym="አማርኛ" data-language-local-name="amharisk" class="interlanguage-link-target"><span>አማርኛ</span></a></li><li class="interlanguage-link interwiki-an mw-list-item"><a href="https://an.wikipedia.org/wiki/Luz" title="Luz – aragonsk" lang="an" hreflang="an" data-title="Luz" data-language-autonym="Aragonés" data-language-local-name="aragonsk" class="interlanguage-link-target"><span>Aragonés</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%B6%D9%88%D8%A1" title="ضوء – arabisk" lang="ar" hreflang="ar" data-title="ضوء" data-language-autonym="العربية" data-language-local-name="arabisk" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-arc mw-list-item"><a href="https://arc.wikipedia.org/wiki/%DC%A2%DC%98%DC%97%DC%AA%DC%90_(%DC%9A%DC%99%DC%9D%DC%AC%DC%90)" title="ܢܘܗܪܐ (ܚܙܝܬܐ) – aramæisk" lang="arc" hreflang="arc" data-title="ܢܘܗܪܐ (ܚܙܝܬܐ)" data-language-autonym="ܐܪܡܝܐ" data-language-local-name="aramæisk" class="interlanguage-link-target"><span>ܐܪܡܝܐ</span></a></li><li class="interlanguage-link interwiki-ary mw-list-item"><a href="https://ary.wikipedia.org/wiki/%D8%B4%D8%B9%D8%A7" title="شعا – Moroccan Arabic" lang="ary" hreflang="ary" data-title="شعا" data-language-autonym="الدارجة" data-language-local-name="Moroccan Arabic" class="interlanguage-link-target"><span>الدارجة</span></a></li><li class="interlanguage-link interwiki-arz mw-list-item"><a href="https://arz.wikipedia.org/wiki/%D8%A7%D9%84%D9%86%D9%88%D8%B1" title="النور – Egyptian Arabic" lang="arz" hreflang="arz" data-title="النور" data-language-autonym="مصرى" data-language-local-name="Egyptian Arabic" class="interlanguage-link-target"><span>مصرى</span></a></li><li class="interlanguage-link interwiki-as mw-list-item"><a href="https://as.wikipedia.org/wiki/%E0%A6%AA%E0%A7%8B%E0%A6%B9%E0%A7%B0" title="পোহৰ – assamesisk" lang="as" hreflang="as" data-title="পোহৰ" data-language-autonym="অসমীয়া" data-language-local-name="assamesisk" class="interlanguage-link-target"><span>অসমীয়া</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Lluz" title="Lluz – asturisk" lang="ast" hreflang="ast" data-title="Lluz" data-language-autonym="Asturianu" data-language-local-name="asturisk" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-ay mw-list-item"><a href="https://ay.wikipedia.org/wiki/Qhana" title="Qhana – aymara" lang="ay" hreflang="ay" data-title="Qhana" data-language-autonym="Aymar aru" data-language-local-name="aymara" class="interlanguage-link-target"><span>Aymar aru</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/%C4%B0%C5%9F%C4%B1q" title="İşıq – aserbajdsjansk" lang="az" hreflang="az" data-title="İşıq" data-language-autonym="Azərbaycanca" data-language-local-name="aserbajdsjansk" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-azb mw-list-item"><a href="https://azb.wikipedia.org/wiki/%D8%A7%DB%8C%D8%B4%DB%8C%D9%82" title="ایشیق – South Azerbaijani" lang="azb" hreflang="azb" data-title="ایشیق" data-language-autonym="تۆرکجه" data-language-local-name="South Azerbaijani" class="interlanguage-link-target"><span>تۆرکجه</span></a></li><li class="interlanguage-link interwiki-ba mw-list-item"><a href="https://ba.wikipedia.org/wiki/%D0%AF%D2%A1%D1%82%D1%8B%D0%BB%D1%8B%D2%A1" title="Яҡтылыҡ – bashkir" lang="ba" hreflang="ba" data-title="Яҡтылыҡ" data-language-autonym="Башҡортса" data-language-local-name="bashkir" class="interlanguage-link-target"><span>Башҡортса</span></a></li><li class="interlanguage-link interwiki-bar mw-list-item"><a href="https://bar.wikipedia.org/wiki/Liacht" title="Liacht – Bavarian" lang="bar" hreflang="bar" data-title="Liacht" data-language-autonym="Boarisch" data-language-local-name="Bavarian" class="interlanguage-link-target"><span>Boarisch</span></a></li><li class="interlanguage-link interwiki-bat-smg mw-list-item"><a href="https://bat-smg.wikipedia.org/wiki/%C5%A0v%C4%97isa" title="Švėisa – Samogitian" lang="sgs" hreflang="sgs" data-title="Švėisa" data-language-autonym="Žemaitėška" data-language-local-name="Samogitian" class="interlanguage-link-target"><span>Žemaitėška</span></a></li><li class="interlanguage-link interwiki-bcl mw-list-item"><a href="https://bcl.wikipedia.org/wiki/Liwanag" title="Liwanag – Central Bikol" lang="bcl" hreflang="bcl" data-title="Liwanag" data-language-autonym="Bikol Central" data-language-local-name="Central Bikol" class="interlanguage-link-target"><span>Bikol Central</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%A1%D0%B2%D1%8F%D1%82%D0%BB%D0%BE" title="Святло – belarusisk" lang="be" hreflang="be" data-title="Святло" data-language-autonym="Беларуская" data-language-local-name="belarusisk" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%A1%D1%8C%D0%B2%D1%8F%D1%82%D0%BB%D0%BE" title="Сьвятло – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Сьвятло" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="Belarusian (Taraškievica orthography)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%A1%D0%B2%D0%B5%D1%82%D0%BB%D0%B8%D0%BD%D0%B0" title="Светлина – bulgarsk" lang="bg" hreflang="bg" data-title="Светлина" data-language-autonym="Български" data-language-local-name="bulgarsk" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%86%E0%A6%B2%E0%A7%8B" title="আলো – bengali" lang="bn" hreflang="bn" data-title="আলো" data-language-autonym="বাংলা" data-language-local-name="bengali" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-bo mw-list-item"><a href="https://bo.wikipedia.org/wiki/%E0%BD%A0%E0%BD%BC%E0%BD%91%E0%BC%8D" title="འོད། – tibetansk" lang="bo" hreflang="bo" data-title="འོད།" data-language-autonym="བོད་ཡིག" data-language-local-name="tibetansk" class="interlanguage-link-target"><span>བོད་ཡིག</span></a></li><li class="interlanguage-link interwiki-br mw-list-item"><a href="https://br.wikipedia.org/wiki/Goulo%C3%B9" title="Gouloù – bretonsk" lang="br" hreflang="br" data-title="Gouloù" data-language-autonym="Brezhoneg" data-language-local-name="bretonsk" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Svjetlost" title="Svjetlost – bosnisk" lang="bs" hreflang="bs" data-title="Svjetlost" data-language-autonym="Bosanski" data-language-local-name="bosnisk" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Llum" title="Llum – catalansk" lang="ca" hreflang="ca" data-title="Llum" data-language-autonym="Català" data-language-local-name="catalansk" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cdo mw-list-item"><a href="https://cdo.wikipedia.org/wiki/Gu%C5%8Fng" title="Guŏng – Mindong" lang="cdo" hreflang="cdo" data-title="Guŏng" data-language-autonym="閩東語 / Mìng-dĕ̤ng-ngṳ̄" data-language-local-name="Mindong" class="interlanguage-link-target"><span>閩東語 / Mìng-dĕ̤ng-ngṳ̄</span></a></li><li class="interlanguage-link interwiki-ceb mw-list-item"><a href="https://ceb.wikipedia.org/wiki/Kahayag" title="Kahayag – cebuano" lang="ceb" hreflang="ceb" data-title="Kahayag" data-language-autonym="Cebuano" data-language-local-name="cebuano" class="interlanguage-link-target"><span>Cebuano</span></a></li><li class="interlanguage-link interwiki-chr mw-list-item"><a href="https://chr.wikipedia.org/wiki/%E1%8E%A2%E1%8E%A6%E1%8E%A2" title="ᎢᎦᎢ – cherokee" lang="chr" hreflang="chr" data-title="ᎢᎦᎢ" data-language-autonym="ᏣᎳᎩ" data-language-local-name="cherokee" class="interlanguage-link-target"><span>ᏣᎳᎩ</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%DA%95%D9%88%D9%88%D9%86%D8%A7%DA%A9%DB%8C" title="ڕووناکی – sorani" lang="ckb" hreflang="ckb" data-title="ڕووناکی" data-language-autonym="کوردی" data-language-local-name="sorani" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Sv%C4%9Btlo" title="Světlo – tjekkisk" lang="cs" hreflang="cs" data-title="Světlo" data-language-autonym="Čeština" data-language-local-name="tjekkisk" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/%C3%87%D1%83%D1%82%C4%83" title="Çутă – tjuvasjisk" lang="cv" hreflang="cv" data-title="Çутă" data-language-autonym="Чӑвашла" data-language-local-name="tjuvasjisk" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Goleuni" title="Goleuni – walisisk" lang="cy" hreflang="cy" data-title="Goleuni" data-language-autonym="Cymraeg" data-language-local-name="walisisk" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-dag mw-list-item"><a href="https://dag.wikipedia.org/wiki/Neesim" title="Neesim – Dagbani" lang="dag" hreflang="dag" data-title="Neesim" data-language-autonym="Dagbanli" data-language-local-name="Dagbani" class="interlanguage-link-target"><span>Dagbanli</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Licht" title="Licht – tysk" lang="de" hreflang="de" data-title="Licht" data-language-autonym="Deutsch" data-language-local-name="tysk" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-dtp mw-list-item"><a href="https://dtp.wikipedia.org/wiki/Naau" title="Naau – Central Dusun" lang="dtp" hreflang="dtp" data-title="Naau" data-language-autonym="Kadazandusun" data-language-local-name="Central Dusun" class="interlanguage-link-target"><span>Kadazandusun</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%A6%CF%89%CF%82" title="Φως – græsk" lang="el" hreflang="el" data-title="Φως" data-language-autonym="Ελληνικά" data-language-local-name="græsk" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Light" title="Light – engelsk" lang="en" hreflang="en" data-title="Light" data-language-autonym="English" data-language-local-name="engelsk" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Lumo" title="Lumo – esperanto" lang="eo" hreflang="eo" data-title="Lumo" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es badge-Q17437798 badge-goodarticle mw-list-item" title="god artikel"><a href="https://es.wikipedia.org/wiki/Luz" title="Luz – spansk" lang="es" hreflang="es" data-title="Luz" data-language-autonym="Español" data-language-local-name="spansk" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Valgus" title="Valgus – estisk" lang="et" hreflang="et" data-title="Valgus" data-language-autonym="Eesti" data-language-local-name="estisk" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Argi" title="Argi – baskisk" lang="eu" hreflang="eu" data-title="Argi" data-language-autonym="Euskara" data-language-local-name="baskisk" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-ext mw-list-item"><a href="https://ext.wikipedia.org/wiki/Lus" title="Lus – Extremaduran" lang="ext" hreflang="ext" data-title="Lus" data-language-autonym="Estremeñu" data-language-local-name="Extremaduran" class="interlanguage-link-target"><span>Estremeñu</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%86%D9%88%D8%B1" title="نور – persisk" lang="fa" hreflang="fa" data-title="نور" data-language-autonym="فارسی" data-language-local-name="persisk" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Valo" title="Valo – finsk" lang="fi" hreflang="fi" data-title="Valo" data-language-autonym="Suomi" data-language-local-name="finsk" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fiu-vro mw-list-item"><a href="https://fiu-vro.wikipedia.org/wiki/Valgus" title="Valgus – Võro" lang="vro" hreflang="vro" data-title="Valgus" data-language-autonym="Võro" data-language-local-name="Võro" class="interlanguage-link-target"><span>Võro</span></a></li><li class="interlanguage-link interwiki-fj mw-list-item"><a href="https://fj.wikipedia.org/wiki/Rarama" title="Rarama – fijiansk" lang="fj" hreflang="fj" data-title="Rarama" data-language-autonym="Na Vosa Vakaviti" data-language-local-name="fijiansk" class="interlanguage-link-target"><span>Na Vosa Vakaviti</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Lumi%C3%A8re" title="Lumière – fransk" lang="fr" hreflang="fr" data-title="Lumière" data-language-autonym="Français" data-language-local-name="fransk" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-frr mw-list-item"><a href="https://frr.wikipedia.org/wiki/Laacht" title="Laacht – nordfrisisk" lang="frr" hreflang="frr" data-title="Laacht" data-language-autonym="Nordfriisk" data-language-local-name="nordfrisisk" class="interlanguage-link-target"><span>Nordfriisk</span></a></li><li class="interlanguage-link interwiki-fy mw-list-item"><a href="https://fy.wikipedia.org/wiki/Ljocht" title="Ljocht – vestfrisisk" lang="fy" hreflang="fy" data-title="Ljocht" data-language-autonym="Frysk" data-language-local-name="vestfrisisk" class="interlanguage-link-target"><span>Frysk</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Solas" title="Solas – irsk" lang="ga" hreflang="ga" data-title="Solas" data-language-autonym="Gaeilge" data-language-local-name="irsk" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gan mw-list-item"><a href="https://gan.wikipedia.org/wiki/%E5%85%89" title="光 – gan-kinesisk" lang="gan" hreflang="gan" data-title="光" data-language-autonym="贛語" data-language-local-name="gan-kinesisk" class="interlanguage-link-target"><span>贛語</span></a></li><li class="interlanguage-link interwiki-gcr mw-list-item"><a href="https://gcr.wikipedia.org/wiki/Limy%C3%A8" title="Limyè – Guianan Creole" lang="gcr" hreflang="gcr" data-title="Limyè" data-language-autonym="Kriyòl gwiyannen" data-language-local-name="Guianan Creole" class="interlanguage-link-target"><span>Kriyòl gwiyannen</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Luz" title="Luz – galicisk" lang="gl" hreflang="gl" data-title="Luz" data-language-autonym="Galego" data-language-local-name="galicisk" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-gn mw-list-item"><a href="https://gn.wikipedia.org/wiki/Tesape" title="Tesape – guarani" lang="gn" hreflang="gn" data-title="Tesape" data-language-autonym="Avañe'ẽ" data-language-local-name="guarani" class="interlanguage-link-target"><span>Avañe'ẽ</span></a></li><li class="interlanguage-link interwiki-gom mw-list-item"><a href="https://gom.wikipedia.org/wiki/%E0%A4%89%E0%A4%9C%E0%A4%B5%E0%A4%BE%E0%A4%A1" title="उजवाड – Goan Konkani" lang="gom" hreflang="gom" data-title="उजवाड" data-language-autonym="गोंयची कोंकणी / Gõychi Konknni" data-language-local-name="Goan Konkani" class="interlanguage-link-target"><span>गोंयची कोंकणी / Gõychi Konknni</span></a></li><li class="interlanguage-link interwiki-gu mw-list-item"><a href="https://gu.wikipedia.org/wiki/%E0%AA%AA%E0%AB%8D%E0%AA%B0%E0%AA%95%E0%AA%BE%E0%AA%B6" title="પ્રકાશ – gujarati" lang="gu" hreflang="gu" data-title="પ્રકાશ" data-language-autonym="ગુજરાતી" data-language-local-name="gujarati" class="interlanguage-link-target"><span>ગુજરાતી</span></a></li><li class="interlanguage-link interwiki-ha mw-list-item"><a href="https://ha.wikipedia.org/wiki/Haske" title="Haske – hausa" lang="ha" hreflang="ha" data-title="Haske" data-language-autonym="Hausa" data-language-local-name="hausa" class="interlanguage-link-target"><span>Hausa</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%90%D7%95%D7%A8" title="אור – hebraisk" lang="he" hreflang="he" data-title="אור" data-language-autonym="עברית" data-language-local-name="hebraisk" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%95%E0%A4%BE%E0%A4%B6" title="प्रकाश – hindi" lang="hi" hreflang="hi" data-title="प्रकाश" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hif mw-list-item"><a href="https://hif.wikipedia.org/wiki/Prakaas" title="Prakaas – Fiji Hindi" lang="hif" hreflang="hif" data-title="Prakaas" data-language-autonym="Fiji Hindi" data-language-local-name="Fiji Hindi" class="interlanguage-link-target"><span>Fiji Hindi</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Svjetlost" title="Svjetlost – kroatisk" lang="hr" hreflang="hr" data-title="Svjetlost" data-language-autonym="Hrvatski" data-language-local-name="kroatisk" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/Limy%C3%A8" title="Limyè – haitisk" lang="ht" hreflang="ht" data-title="Limyè" data-language-autonym="Kreyòl ayisyen" data-language-local-name="haitisk" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/F%C3%A9ny" title="Fény – ungarsk" lang="hu" hreflang="hu" data-title="Fény" data-language-autonym="Magyar" data-language-local-name="ungarsk" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%BC%D5%B8%D6%82%D5%B5%D5%BD" title="Լույս – armensk" lang="hy" hreflang="hy" data-title="Լույս" data-language-autonym="Հայերեն" data-language-local-name="armensk" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-hyw mw-list-item"><a href="https://hyw.wikipedia.org/wiki/%D4%BC%D5%B8%D5%B5%D5%BD" title="Լոյս – Western Armenian" lang="hyw" hreflang="hyw" data-title="Լոյս" data-language-autonym="Արեւմտահայերէն" data-language-local-name="Western Armenian" class="interlanguage-link-target"><span>Արեւմտահայերէն</span></a></li><li class="interlanguage-link interwiki-ia mw-list-item"><a href="https://ia.wikipedia.org/wiki/Lumine" title="Lumine – interlingua" lang="ia" hreflang="ia" data-title="Lumine" data-language-autonym="Interlingua" data-language-local-name="interlingua" class="interlanguage-link-target"><span>Interlingua</span></a></li><li class="interlanguage-link interwiki-iba mw-list-item"><a href="https://iba.wikipedia.org/wiki/Penampak" title="Penampak – iban" lang="iba" hreflang="iba" data-title="Penampak" data-language-autonym="Jaku Iban" data-language-local-name="iban" class="interlanguage-link-target"><span>Jaku Iban</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Cahaya" title="Cahaya – indonesisk" lang="id" hreflang="id" data-title="Cahaya" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesisk" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-ie mw-list-item"><a href="https://ie.wikipedia.org/wiki/L%C3%BAmine" title="Lúmine – interlingue" lang="ie" hreflang="ie" data-title="Lúmine" data-language-autonym="Interlingue" data-language-local-name="interlingue" class="interlanguage-link-target"><span>Interlingue</span></a></li><li class="interlanguage-link interwiki-ilo mw-list-item"><a href="https://ilo.wikipedia.org/wiki/Lawag" title="Lawag – iloko" lang="ilo" hreflang="ilo" data-title="Lawag" data-language-autonym="Ilokano" data-language-local-name="iloko" class="interlanguage-link-target"><span>Ilokano</span></a></li><li class="interlanguage-link interwiki-inh mw-list-item"><a href="https://inh.wikipedia.org/wiki/%D0%A1%D0%B5%D1%80%D0%B4%D0%B0%D0%BB%D0%BE" title="Сердало – ingush" lang="inh" hreflang="inh" data-title="Сердало" data-language-autonym="ГӀалгӀай" data-language-local-name="ingush" class="interlanguage-link-target"><span>ГӀалгӀай</span></a></li><li class="interlanguage-link interwiki-io mw-list-item"><a href="https://io.wikipedia.org/wiki/Lumo" title="Lumo – ido" lang="io" hreflang="io" data-title="Lumo" data-language-autonym="Ido" data-language-local-name="ido" class="interlanguage-link-target"><span>Ido</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Lj%C3%B3s" title="Ljós – islandsk" lang="is" hreflang="is" data-title="Ljós" data-language-autonym="Íslenska" data-language-local-name="islandsk" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Luce" title="Luce – italiensk" lang="it" hreflang="it" data-title="Luce" data-language-autonym="Italiano" data-language-local-name="italiensk" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E5%85%89" title="光 – japansk" lang="ja" hreflang="ja" data-title="光" data-language-autonym="日本語" data-language-local-name="japansk" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-jam mw-list-item"><a href="https://jam.wikipedia.org/wiki/Lait" title="Lait – Jamaican Creole English" lang="jam" hreflang="jam" data-title="Lait" data-language-autonym="Patois" data-language-local-name="Jamaican Creole English" class="interlanguage-link-target"><span>Patois</span></a></li><li class="interlanguage-link interwiki-jbo mw-list-item"><a href="https://jbo.wikipedia.org/wiki/gusni" title="gusni – lojban" lang="jbo" hreflang="jbo" data-title="gusni" data-language-autonym="La .lojban." data-language-local-name="lojban" class="interlanguage-link-target"><span>La .lojban.</span></a></li><li class="interlanguage-link interwiki-jv mw-list-item"><a href="https://jv.wikipedia.org/wiki/Cahya" title="Cahya – javanesisk" lang="jv" hreflang="jv" data-title="Cahya" data-language-autonym="Jawa" data-language-local-name="javanesisk" class="interlanguage-link-target"><span>Jawa</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%A1%E1%83%98%E1%83%9C%E1%83%90%E1%83%97%E1%83%9A%E1%83%94" title="სინათლე – georgisk" lang="ka" hreflang="ka" data-title="სინათლე" data-language-autonym="ქართული" data-language-local-name="georgisk" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kab mw-list-item"><a href="https://kab.wikipedia.org/wiki/Tafat" title="Tafat – kabylsk" lang="kab" hreflang="kab" data-title="Tafat" data-language-autonym="Taqbaylit" data-language-local-name="kabylsk" class="interlanguage-link-target"><span>Taqbaylit</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%96%D0%B0%D1%80%D1%8B%D2%9B" title="Жарық – kasakhisk" lang="kk" hreflang="kk" data-title="Жарық" data-language-autonym="Қазақша" data-language-local-name="kasakhisk" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-km mw-list-item"><a href="https://km.wikipedia.org/wiki/%E1%9E%96%E1%9E%93%E1%9F%92%E1%9E%9B%E1%9E%BA" title="ពន្លឺ – khmer" lang="km" hreflang="km" data-title="ពន្លឺ" data-language-autonym="ភាសាខ្មែរ" data-language-local-name="khmer" class="interlanguage-link-target"><span>ភាសាខ្មែរ</span></a></li><li class="interlanguage-link interwiki-kn mw-list-item"><a href="https://kn.wikipedia.org/wiki/%E0%B2%AC%E0%B3%86%E0%B2%B3%E0%B2%95%E0%B3%81" title="ಬೆಳಕು – kannada" lang="kn" hreflang="kn" data-title="ಬೆಳಕು" data-language-autonym="ಕನ್ನಡ" data-language-local-name="kannada" class="interlanguage-link-target"><span>ಕನ್ನಡ</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EB%B9%9B" title="빛 – koreansk" lang="ko" hreflang="ko" data-title="빛" data-language-autonym="한국어" data-language-local-name="koreansk" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-ks mw-list-item"><a href="https://ks.wikipedia.org/wiki/%DA%AF%D8%A7%D8%B4" title="گاش – kashmiri" lang="ks" hreflang="ks" data-title="گاش" data-language-autonym="कॉशुर / کٲشُر" data-language-local-name="kashmiri" class="interlanguage-link-target"><span>कॉशुर / کٲشُر</span></a></li><li class="interlanguage-link interwiki-ku mw-list-item"><a href="https://ku.wikipedia.org/wiki/Ronah%C3%AE_(fiz%C3%AEk)" title="Ronahî (fizîk) – kurdisk" lang="ku" hreflang="ku" data-title="Ronahî (fizîk)" data-language-autonym="Kurdî" data-language-local-name="kurdisk" class="interlanguage-link-target"><span>Kurdî</span></a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wikipedia.org/wiki/%D0%96%D0%B0%D1%80%D1%8B%D0%BA" title="Жарык – kirgisisk" lang="ky" hreflang="ky" data-title="Жарык" data-language-autonym="Кыргызча" data-language-local-name="kirgisisk" class="interlanguage-link-target"><span>Кыргызча</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Lux" title="Lux – latin" lang="la" hreflang="la" data-title="Lux" data-language-autonym="Latina" data-language-local-name="latin" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Liicht" title="Liicht – luxembourgsk" lang="lb" hreflang="lb" data-title="Liicht" data-language-autonym="Lëtzebuergesch" data-language-local-name="luxembourgsk" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-lfn mw-list-item"><a href="https://lfn.wikipedia.org/wiki/Lus" title="Lus – Lingua Franca Nova" lang="lfn" hreflang="lfn" data-title="Lus" data-language-autonym="Lingua Franca Nova" data-language-local-name="Lingua Franca Nova" class="interlanguage-link-target"><span>Lingua Franca Nova</span></a></li><li class="interlanguage-link interwiki-lg mw-list-item"><a href="https://lg.wikipedia.org/wiki/Ekitangaala" title="Ekitangaala – ganda" lang="lg" hreflang="lg" data-title="Ekitangaala" data-language-autonym="Luganda" data-language-local-name="ganda" class="interlanguage-link-target"><span>Luganda</span></a></li><li class="interlanguage-link interwiki-li mw-list-item"><a href="https://li.wikipedia.org/wiki/L%C3%A8ch" title="Lèch – limburgsk" lang="li" hreflang="li" data-title="Lèch" data-language-autonym="Limburgs" data-language-local-name="limburgsk" class="interlanguage-link-target"><span>Limburgs</span></a></li><li class="interlanguage-link interwiki-lij mw-list-item"><a href="https://lij.wikipedia.org/wiki/Luxe" title="Luxe – Ligurian" lang="lij" hreflang="lij" data-title="Luxe" data-language-autonym="Ligure" data-language-local-name="Ligurian" class="interlanguage-link-target"><span>Ligure</span></a></li><li class="interlanguage-link interwiki-lmo mw-list-item"><a href="https://lmo.wikipedia.org/wiki/L%C3%BCs" title="Lüs – Lombard" lang="lmo" hreflang="lmo" data-title="Lüs" data-language-autonym="Lombard" data-language-local-name="Lombard" class="interlanguage-link-target"><span>Lombard</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/%C5%A0viesa" title="Šviesa – litauisk" lang="lt" hreflang="lt" data-title="Šviesa" data-language-autonym="Lietuvių" data-language-local-name="litauisk" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Gaisma" title="Gaisma – lettisk" lang="lv" hreflang="lv" data-title="Gaisma" data-language-autonym="Latviešu" data-language-local-name="lettisk" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-mg mw-list-item"><a href="https://mg.wikipedia.org/wiki/Fahazavana" title="Fahazavana – malagassisk" lang="mg" hreflang="mg" data-title="Fahazavana" data-language-autonym="Malagasy" data-language-local-name="malagassisk" class="interlanguage-link-target"><span>Malagasy</span></a></li><li class="interlanguage-link interwiki-min mw-list-item"><a href="https://min.wikipedia.org/wiki/Cahayo" title="Cahayo – minangkabau" lang="min" hreflang="min" data-title="Cahayo" data-language-autonym="Minangkabau" data-language-local-name="minangkabau" class="interlanguage-link-target"><span>Minangkabau</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%A1%D0%B2%D0%B5%D1%82%D0%BB%D0%B8%D0%BD%D0%B0" title="Светлина – makedonsk" lang="mk" hreflang="mk" data-title="Светлина" data-language-autonym="Македонски" data-language-local-name="makedonsk" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%AA%E0%B5%8D%E0%B4%B0%E0%B4%95%E0%B4%BE%E0%B4%B6%E0%B4%82" title="പ്രകാശം – malayalam" lang="ml" hreflang="ml" data-title="പ്രകാശം" data-language-autonym="മലയാളം" data-language-local-name="malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%93%D1%8D%D1%80%D1%8D%D0%BB" title="Гэрэл – mongolsk" lang="mn" hreflang="mn" data-title="Гэрэл" data-language-autonym="Монгол" data-language-local-name="mongolsk" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%95%E0%A4%BE%E0%A4%B6" title="प्रकाश – marathisk" lang="mr" hreflang="mr" data-title="प्रकाश" data-language-autonym="मराठी" data-language-local-name="marathisk" class="interlanguage-link-target"><span>मराठी</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Cahaya" title="Cahaya – malajisk" lang="ms" hreflang="ms" data-title="Cahaya" data-language-autonym="Bahasa Melayu" data-language-local-name="malajisk" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-mwl mw-list-item"><a href="https://mwl.wikipedia.org/wiki/Lu%C3%A7" title="Luç – mirandesisk" lang="mwl" hreflang="mwl" data-title="Luç" data-language-autonym="Mirandés" data-language-local-name="mirandesisk" class="interlanguage-link-target"><span>Mirandés</span></a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%80%A1%E1%80%9C%E1%80%84%E1%80%BA%E1%80%B8" title="အလင်း – burmesisk" lang="my" hreflang="my" data-title="အလင်း" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="burmesisk" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-mzn mw-list-item"><a href="https://mzn.wikipedia.org/wiki/%D8%B3%D9%88" title="سو – mazenisk" lang="mzn" hreflang="mzn" data-title="سو" data-language-autonym="مازِرونی" data-language-local-name="mazenisk" class="interlanguage-link-target"><span>مازِرونی</span></a></li><li class="interlanguage-link interwiki-nah mw-list-item"><a href="https://nah.wikipedia.org/wiki/Tl%C4%81hu%C4%ABlli" title="Tlāhuīlli – Nahuatl" lang="nah" hreflang="nah" data-title="Tlāhuīlli" data-language-autonym="Nāhuatl" data-language-local-name="Nahuatl" class="interlanguage-link-target"><span>Nāhuatl</span></a></li><li class="interlanguage-link interwiki-nap mw-list-item"><a href="https://nap.wikipedia.org/wiki/Luce" title="Luce – napolitansk" lang="nap" hreflang="nap" data-title="Luce" data-language-autonym="Napulitano" data-language-local-name="napolitansk" class="interlanguage-link-target"><span>Napulitano</span></a></li><li class="interlanguage-link interwiki-nds mw-list-item"><a href="https://nds.wikipedia.org/wiki/Licht" title="Licht – nedertysk" lang="nds" hreflang="nds" data-title="Licht" data-language-autonym="Plattdüütsch" data-language-local-name="nedertysk" class="interlanguage-link-target"><span>Plattdüütsch</span></a></li><li class="interlanguage-link interwiki-nds-nl mw-list-item"><a href="https://nds-nl.wikipedia.org/wiki/Locht_(straoling)" title="Locht (straoling) – plattysk (Holland)" lang="nds-NL" hreflang="nds-NL" data-title="Locht (straoling)" data-language-autonym="Nedersaksies" data-language-local-name="plattysk (Holland)" class="interlanguage-link-target"><span>Nedersaksies</span></a></li><li class="interlanguage-link interwiki-ne mw-list-item"><a href="https://ne.wikipedia.org/wiki/%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%95%E0%A4%BE%E0%A4%B6" title="प्रकाश – nepalesisk" lang="ne" hreflang="ne" data-title="प्रकाश" data-language-autonym="नेपाली" data-language-local-name="nepalesisk" class="interlanguage-link-target"><span>नेपाली</span></a></li><li class="interlanguage-link interwiki-new mw-list-item"><a href="https://new.wikipedia.org/wiki/%E0%A4%9C%E0%A4%83" title="जः – newari" lang="new" hreflang="new" data-title="जः" data-language-autonym="नेपाल भाषा" data-language-local-name="newari" class="interlanguage-link-target"><span>नेपाल भाषा</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Licht" title="Licht – nederlandsk" lang="nl" hreflang="nl" data-title="Licht" data-language-autonym="Nederlands" data-language-local-name="nederlandsk" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Lys" title="Lys – nynorsk" lang="nn" hreflang="nn" data-title="Lys" data-language-autonym="Norsk nynorsk" data-language-local-name="nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Lys" title="Lys – bokmål" lang="nb" hreflang="nb" data-title="Lys" data-language-autonym="Norsk bokmål" data-language-local-name="bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-nov mw-list-item"><a href="https://nov.wikipedia.org/wiki/Lume" title="Lume – Novial" lang="nov" hreflang="nov" data-title="Lume" data-language-autonym="Novial" data-language-local-name="Novial" class="interlanguage-link-target"><span>Novial</span></a></li><li class="interlanguage-link interwiki-nrm mw-list-item"><a href="https://nrm.wikipedia.org/wiki/Lumyire" title="Lumyire – Norman" lang="nrf" hreflang="nrf" data-title="Lumyire" data-language-autonym="Nouormand" data-language-local-name="Norman" class="interlanguage-link-target"><span>Nouormand</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Lutz" title="Lutz – occitansk" lang="oc" hreflang="oc" data-title="Lutz" data-language-autonym="Occitan" data-language-local-name="occitansk" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-om mw-list-item"><a href="https://om.wikipedia.org/wiki/Ifa" title="Ifa – oromo" lang="om" hreflang="om" data-title="Ifa" data-language-autonym="Oromoo" data-language-local-name="oromo" class="interlanguage-link-target"><span>Oromoo</span></a></li><li class="interlanguage-link interwiki-or mw-list-item"><a href="https://or.wikipedia.org/wiki/%E0%AC%86%E0%AC%B2%E0%AD%8B%E0%AC%95" title="ଆଲୋକ – oriya" lang="or" hreflang="or" data-title="ଆଲୋକ" data-language-autonym="ଓଡ଼ିଆ" data-language-local-name="oriya" class="interlanguage-link-target"><span>ଓଡ଼ିଆ</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%AA%E0%A9%8D%E0%A8%B0%E0%A8%95%E0%A8%BE%E0%A8%B8%E0%A8%BC" title="ਪ੍ਰਕਾਸ਼ – punjabisk" lang="pa" hreflang="pa" data-title="ਪ੍ਰਕਾਸ਼" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="punjabisk" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pdc mw-list-item"><a href="https://pdc.wikipedia.org/wiki/Licht" title="Licht – Pennsylvania German" lang="pdc" hreflang="pdc" data-title="Licht" data-language-autonym="Deitsch" data-language-local-name="Pennsylvania German" class="interlanguage-link-target"><span>Deitsch</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/%C5%9Awiat%C5%82o" title="Światło – polsk" lang="pl" hreflang="pl" data-title="Światło" data-language-autonym="Polski" data-language-local-name="polsk" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pms mw-list-item"><a href="https://pms.wikipedia.org/wiki/Lus" title="Lus – Piedmontese" lang="pms" hreflang="pms" data-title="Lus" data-language-autonym="Piemontèis" data-language-local-name="Piedmontese" class="interlanguage-link-target"><span>Piemontèis</span></a></li><li class="interlanguage-link interwiki-pnb mw-list-item"><a href="https://pnb.wikipedia.org/wiki/%DA%86%D8%A7%D9%86%DD%A8" title="چانݨ – Western Punjabi" lang="pnb" hreflang="pnb" data-title="چانݨ" data-language-autonym="پنجابی" data-language-local-name="Western Punjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Luz" title="Luz – portugisisk" lang="pt" hreflang="pt" data-title="Luz" data-language-autonym="Português" data-language-local-name="portugisisk" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-qu mw-list-item"><a href="https://qu.wikipedia.org/wiki/Achkiy" title="Achkiy – quechua" lang="qu" hreflang="qu" data-title="Achkiy" data-language-autonym="Runa Simi" data-language-local-name="quechua" class="interlanguage-link-target"><span>Runa Simi</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Lumin%C4%83" title="Lumină – rumænsk" lang="ro" hreflang="ro" data-title="Lumină" data-language-autonym="Română" data-language-local-name="rumænsk" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-roa-rup mw-list-item"><a href="https://roa-rup.wikipedia.org/wiki/Lu%C5%84in%C3%A2" title="Luńinâ – arumænsk" lang="rup" hreflang="rup" data-title="Luńinâ" data-language-autonym="Armãneashti" data-language-local-name="arumænsk" class="interlanguage-link-target"><span>Armãneashti</span></a></li><li class="interlanguage-link interwiki-rsk mw-list-item"><a href="https://rsk.wikipedia.org/wiki/%D0%A8%D0%B2%D0%B5%D1%82%D0%BB%D0%BE%D1%81%D1%86" title="Шветлосц – Pannonian Rusyn" lang="rsk" hreflang="rsk" data-title="Шветлосц" data-language-autonym="Руски" data-language-local-name="Pannonian Rusyn" class="interlanguage-link-target"><span>Руски</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%A1%D0%B2%D0%B5%D1%82" title="Свет – russisk" lang="ru" hreflang="ru" data-title="Свет" data-language-autonym="Русский" data-language-local-name="russisk" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-rue mw-list-item"><a href="https://rue.wikipedia.org/wiki/%D0%A1%D0%B2%D1%96%D1%82%D0%BB%D0%BE" title="Світло – Rusyn" lang="rue" hreflang="rue" data-title="Світло" data-language-autonym="Русиньскый" data-language-local-name="Rusyn" class="interlanguage-link-target"><span>Русиньскый</span></a></li><li class="interlanguage-link interwiki-sa mw-list-item"><a href="https://sa.wikipedia.org/wiki/%E0%A4%A6%E0%A5%8D%E0%A4%AF%E0%A5%81%E0%A4%A4%E0%A4%BF%E0%A4%B6%E0%A4%95%E0%A5%8D%E0%A4%A4%E0%A4%BF%E0%A4%83" title="द्युतिशक्तिः – sanskrit" lang="sa" hreflang="sa" data-title="द्युतिशक्तिः" data-language-autonym="संस्कृतम्" data-language-local-name="sanskrit" class="interlanguage-link-target"><span>संस्कृतम्</span></a></li><li class="interlanguage-link interwiki-sah mw-list-item"><a href="https://sah.wikipedia.org/wiki/%D0%A1%D1%8B%D1%80%D0%B4%D1%8B%D0%BA" title="Сырдык – jakutisk" lang="sah" hreflang="sah" data-title="Сырдык" data-language-autonym="Саха тыла" data-language-local-name="jakutisk" class="interlanguage-link-target"><span>Саха тыла</span></a></li><li class="interlanguage-link interwiki-sat mw-list-item"><a href="https://sat.wikipedia.org/wiki/%E1%B1%A2%E1%B1%9F%E1%B1%A8%E1%B1%A5%E1%B1%9F%E1%B1%9E" title="ᱢᱟᱨᱥᱟᱞ – santali" lang="sat" hreflang="sat" data-title="ᱢᱟᱨᱥᱟᱞ" data-language-autonym="ᱥᱟᱱᱛᱟᱲᱤ" data-language-local-name="santali" class="interlanguage-link-target"><span>ᱥᱟᱱᱛᱟᱲᱤ</span></a></li><li class="interlanguage-link interwiki-scn mw-list-item"><a href="https://scn.wikipedia.org/wiki/Luci" title="Luci – siciliansk" lang="scn" hreflang="scn" data-title="Luci" data-language-autonym="Sicilianu" data-language-local-name="siciliansk" class="interlanguage-link-target"><span>Sicilianu</span></a></li><li class="interlanguage-link interwiki-sco mw-list-item"><a href="https://sco.wikipedia.org/wiki/Licht" title="Licht – skotsk" lang="sco" hreflang="sco" data-title="Licht" data-language-autonym="Scots" data-language-local-name="skotsk" class="interlanguage-link-target"><span>Scots</span></a></li><li class="interlanguage-link interwiki-sd mw-list-item"><a href="https://sd.wikipedia.org/wiki/%D8%B1%D9%88%D8%B4%D9%86%D9%8A" title="روشني – sindhi" lang="sd" hreflang="sd" data-title="روشني" data-language-autonym="سنڌي" data-language-local-name="sindhi" class="interlanguage-link-target"><span>سنڌي</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Svetlost" title="Svetlost – serbokroatisk" lang="sh" hreflang="sh" data-title="Svetlost" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbokroatisk" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-si mw-list-item"><a href="https://si.wikipedia.org/wiki/%E0%B6%86%E0%B6%BD%E0%B7%9D%E0%B6%9A%E0%B6%BA" title="ආලෝකය – singalesisk" lang="si" hreflang="si" data-title="ආලෝකය" data-language-autonym="සිංහල" data-language-local-name="singalesisk" class="interlanguage-link-target"><span>සිංහල</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Light" title="Light – Simple English" lang="en-simple" hreflang="en-simple" data-title="Light" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Vidite%C4%BEn%C3%A9_svetlo" title="Viditeľné svetlo – slovakisk" lang="sk" hreflang="sk" data-title="Viditeľné svetlo" data-language-autonym="Slovenčina" data-language-local-name="slovakisk" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Svetloba" title="Svetloba – slovensk" lang="sl" hreflang="sl" data-title="Svetloba" data-language-autonym="Slovenščina" data-language-local-name="slovensk" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sn mw-list-item"><a href="https://sn.wikipedia.org/wiki/Chiedza" title="Chiedza – shona" lang="sn" hreflang="sn" data-title="Chiedza" data-language-autonym="ChiShona" data-language-local-name="shona" class="interlanguage-link-target"><span>ChiShona</span></a></li><li class="interlanguage-link interwiki-so mw-list-item"><a href="https://so.wikipedia.org/wiki/Ileys" title="Ileys – somali" lang="so" hreflang="so" data-title="Ileys" data-language-autonym="Soomaaliga" data-language-local-name="somali" class="interlanguage-link-target"><span>Soomaaliga</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Drita" title="Drita – albansk" lang="sq" hreflang="sq" data-title="Drita" data-language-autonym="Shqip" data-language-local-name="albansk" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%A1%D0%B2%D0%B5%D1%82%D0%BB%D0%BE%D1%81%D1%82" title="Светлост – serbisk" lang="sr" hreflang="sr" data-title="Светлост" data-language-autonym="Српски / srpski" data-language-local-name="serbisk" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-stq mw-list-item"><a href="https://stq.wikipedia.org/wiki/Lucht" title="Lucht – Saterland Frisian" lang="stq" hreflang="stq" data-title="Lucht" data-language-autonym="Seeltersk" data-language-local-name="Saterland Frisian" class="interlanguage-link-target"><span>Seeltersk</span></a></li><li class="interlanguage-link interwiki-su mw-list-item"><a href="https://su.wikipedia.org/wiki/Cahya" title="Cahya – sundanesisk" lang="su" hreflang="su" data-title="Cahya" data-language-autonym="Sunda" data-language-local-name="sundanesisk" class="interlanguage-link-target"><span>Sunda</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Ljus" title="Ljus – svensk" lang="sv" hreflang="sv" data-title="Ljus" data-language-autonym="Svenska" data-language-local-name="svensk" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Nuru" title="Nuru – swahili" lang="sw" hreflang="sw" data-title="Nuru" data-language-autonym="Kiswahili" data-language-local-name="swahili" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-szl mw-list-item"><a href="https://szl.wikipedia.org/wiki/%C5%9Awiat%C5%82o" title="Światło – Silesian" lang="szl" hreflang="szl" data-title="Światło" data-language-autonym="Ślůnski" data-language-local-name="Silesian" class="interlanguage-link-target"><span>Ślůnski</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%92%E0%AE%B3%E0%AE%BF" title="ஒளி – tamil" lang="ta" hreflang="ta" data-title="ஒளி" data-language-autonym="தமிழ்" data-language-local-name="tamil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-te mw-list-item"><a href="https://te.wikipedia.org/wiki/%E0%B0%95%E0%B0%BE%E0%B0%82%E0%B0%A4%E0%B0%BF" title="కాంతి – telugu" lang="te" hreflang="te" data-title="కాంతి" data-language-autonym="తెలుగు" data-language-local-name="telugu" class="interlanguage-link-target"><span>తెలుగు</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B9%81%E0%B8%AA%E0%B8%87" title="แสง – thai" lang="th" hreflang="th" data-title="แสง" data-language-autonym="ไทย" data-language-local-name="thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tl mw-list-item"><a href="https://tl.wikipedia.org/wiki/Liwanag" title="Liwanag – tagalog" lang="tl" hreflang="tl" data-title="Liwanag" data-language-autonym="Tagalog" data-language-local-name="tagalog" class="interlanguage-link-target"><span>Tagalog</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/I%C5%9F%C4%B1k" title="Işık – tyrkisk" lang="tr" hreflang="tr" data-title="Işık" data-language-autonym="Türkçe" data-language-local-name="tyrkisk" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-ts mw-list-item"><a href="https://ts.wikipedia.org/wiki/Rivoningo" title="Rivoningo – tsonga" lang="ts" hreflang="ts" data-title="Rivoningo" data-language-autonym="Xitsonga" data-language-local-name="tsonga" class="interlanguage-link-target"><span>Xitsonga</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/%D0%AF%D0%BA%D1%82%D1%8B%D0%BB%D1%8B%D0%BA" title="Яктылык – tatarisk" lang="tt" hreflang="tt" data-title="Яктылык" data-language-autonym="Татарча / tatarça" data-language-local-name="tatarisk" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-tyv mw-list-item"><a href="https://tyv.wikipedia.org/wiki/%D0%A7%D1%8B%D1%80%D1%8B%D0%BA" title="Чырык – tuvinian" lang="tyv" hreflang="tyv" data-title="Чырык" data-language-autonym="Тыва дыл" data-language-local-name="tuvinian" class="interlanguage-link-target"><span>Тыва дыл</span></a></li><li class="interlanguage-link interwiki-udm mw-list-item"><a href="https://udm.wikipedia.org/wiki/%D0%AE%D0%B3%D1%8B%D1%82" title="Югыт – udmurt" lang="udm" hreflang="udm" data-title="Югыт" data-language-autonym="Удмурт" data-language-local-name="udmurt" class="interlanguage-link-target"><span>Удмурт</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%A1%D0%B2%D1%96%D1%82%D0%BB%D0%BE" title="Світло – ukrainsk" lang="uk" hreflang="uk" data-title="Світло" data-language-autonym="Українська" data-language-local-name="ukrainsk" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%D8%B1%D9%88%D8%B4%D9%86%DB%8C" title="روشنی – urdu" lang="ur" hreflang="ur" data-title="روشنی" data-language-autonym="اردو" data-language-local-name="urdu" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Yorug%CA%BBlik" title="Yorugʻlik – usbekisk" lang="uz" hreflang="uz" data-title="Yorugʻlik" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="usbekisk" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-vec mw-list-item"><a href="https://vec.wikipedia.org/wiki/%C5%81uze" title="Łuze – Venetian" lang="vec" hreflang="vec" data-title="Łuze" data-language-autonym="Vèneto" data-language-local-name="Venetian" class="interlanguage-link-target"><span>Vèneto</span></a></li><li class="interlanguage-link interwiki-vep mw-list-item"><a href="https://vep.wikipedia.org/wiki/Vauktuz" title="Vauktuz – Veps" lang="vep" hreflang="vep" data-title="Vauktuz" data-language-autonym="Vepsän kel’" data-language-local-name="Veps" class="interlanguage-link-target"><span>Vepsän kel’</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/%C3%81nh_s%C3%A1ng" title="Ánh sáng – vietnamesisk" lang="vi" hreflang="vi" data-title="Ánh sáng" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamesisk" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-vo mw-list-item"><a href="https://vo.wikipedia.org/wiki/Lit" title="Lit – volapyk" lang="vo" hreflang="vo" data-title="Lit" data-language-autonym="Volapük" data-language-local-name="volapyk" class="interlanguage-link-target"><span>Volapük</span></a></li><li class="interlanguage-link interwiki-wa mw-list-item"><a href="https://wa.wikipedia.org/wiki/Loumire" title="Loumire – vallonsk" lang="wa" hreflang="wa" data-title="Loumire" data-language-autonym="Walon" data-language-local-name="vallonsk" class="interlanguage-link-target"><span>Walon</span></a></li><li class="interlanguage-link interwiki-war mw-list-item"><a href="https://war.wikipedia.org/wiki/Lamrag" title="Lamrag – waray" lang="war" hreflang="war" data-title="Lamrag" data-language-autonym="Winaray" data-language-local-name="waray" class="interlanguage-link-target"><span>Winaray</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E5%85%89" title="光 – wu-kinesisk" lang="wuu" hreflang="wuu" data-title="光" data-language-autonym="吴语" data-language-local-name="wu-kinesisk" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-xmf mw-list-item"><a href="https://xmf.wikipedia.org/wiki/%E1%83%A1%E1%83%98%E1%83%9C%E1%83%97%E1%83%94" title="სინთე – Mingrelian" lang="xmf" hreflang="xmf" data-title="სინთე" data-language-autonym="მარგალური" data-language-local-name="Mingrelian" class="interlanguage-link-target"><span>მარგალური</span></a></li><li class="interlanguage-link interwiki-yi mw-list-item"><a href="https://yi.wikipedia.org/wiki/%D7%9C%D7%99%D7%9B%D7%98" title="ליכט – jiddisch" lang="yi" hreflang="yi" data-title="ליכט" data-language-autonym="ייִדיש" data-language-local-name="jiddisch" class="interlanguage-link-target"><span>ייִדיש</span></a></li><li class="interlanguage-link interwiki-yo mw-list-item"><a href="https://yo.wikipedia.org/wiki/%C3%8Cm%E1%BB%8D%CC%81l%E1%BA%B9%CC%80" title="Ìmọ́lẹ̀ – yoruba" lang="yo" hreflang="yo" data-title="Ìmọ́lẹ̀" data-language-autonym="Yorùbá" data-language-local-name="yoruba" class="interlanguage-link-target"><span>Yorùbá</span></a></li><li class="interlanguage-link interwiki-za mw-list-item"><a href="https://za.wikipedia.org/wiki/Rongh" title="Rongh – zhuang" lang="za" hreflang="za" data-title="Rongh" data-language-autonym="Vahcuengh" data-language-local-name="zhuang" class="interlanguage-link-target"><span>Vahcuengh</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%85%89" title="光 – kinesisk" lang="zh" hreflang="zh" data-title="光" data-language-autonym="中文" data-language-local-name="kinesisk" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-classical mw-list-item"><a href="https://zh-classical.wikipedia.org/wiki/%E5%85%89" title="光 – Literary Chinese" lang="lzh" hreflang="lzh" data-title="光" data-language-autonym="文言" data-language-local-name="Literary Chinese" class="interlanguage-link-target"><span>文言</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/Kng" title="Kng – min-kinesisk" lang="nan" hreflang="nan" data-title="Kng" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="min-kinesisk" class="interlanguage-link-target"><span>閩南語 / Bân-lâm-gú</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E5%85%89" title="光 – kantonesisk" lang="yue" hreflang="yue" data-title="光" data-language-autonym="粵語" data-language-local-name="kantonesisk" class="interlanguage-link-target"><span>粵語</span></a></li><li class="interlanguage-link interwiki-zu mw-list-item"><a href="https://zu.wikipedia.org/wiki/Ukukhanya" title="Ukukhanya – zulu" lang="zu" hreflang="zu" data-title="Ukukhanya" data-language-autonym="IsiZulu" data-language-local-name="zulu" class="interlanguage-link-target"><span>IsiZulu</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q9128#sitelinks-wikipedia" title="Redigér sproglinks" class="wbc-editpage">Redigér links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Navnerum"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Lys" title="Se indholdssiden [c]" accesskey="c"><span>Artikel</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Diskussion:Lys" rel="discussion" title="Diskussion om indholdet på siden [t]" accesskey="t"><span>Diskussion</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Ændr sprogvariant" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">dansk</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="Visninger"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Lys"><span>Læs</span></a></li><li id="ca-ve-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Lys&veaction=edit" title="Redigér denne side [v]" accesskey="v"><span>Redigér</span></a></li><li id="ca-edit" class="collapsible vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Lys&action=edit" title="Rediger kildekoden for denne side [e]" accesskey="e"><span>Rediger kildekode</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Lys&action=history" title="Tidligere versioner af denne side [h]" accesskey="h"><span>Se historik</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Sideværktøjer"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="Værktøjer" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Værktøjer</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Værktøjer</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">flyt til sidebjælken</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">skjul</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="Flere muligheder" > <div class="vector-menu-heading"> Handlinger </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/Lys"><span>Læs</span></a></li><li id="ca-more-ve-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Lys&veaction=edit" title="Redigér denne side [v]" accesskey="v"><span>Redigér</span></a></li><li id="ca-more-edit" class="collapsible vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Lys&action=edit" title="Rediger kildekoden for denne side [e]" accesskey="e"><span>Rediger kildekode</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Lys&action=history"><span>Se historik</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> Generelt </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Speciel:Hvad_linker_hertil/Lys" title="Liste med alle sider som henviser hertil [j]" accesskey="j"><span>Hvad henviser hertil</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Speciel:Relaterede_%C3%A6ndringer/Lys" rel="nofollow" title="Seneste ændringer af sider som denne side henviser til [k]" accesskey="k"><span>Beslægtede ændringer</span></a></li><li id="t-upload" class="mw-list-item"><a href="//commons.wikimedia.org/wiki/Special:UploadWizard?uselang=da&campaign=dk" title="Upload filer [u]" accesskey="u"><span>Upload fil</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Speciel:Specialsider" title="Liste over alle specialsider [q]" accesskey="q"><span>Specialsider</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=Lys&oldid=11388604" title="Permanent link til denne version af denne side"><span>Permanent link</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=Lys&action=info" title="Yderligere oplysninger om denne side"><span>Sideinformation</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Speciel:Citer&page=Lys&id=11388604&wpFormIdentifier=titleform" title="Information om, hvordan man kan citere denne side"><span>Referer til denne side</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Speciel:UrlShortener&url=https%3A%2F%2Fda.wikipedia.org%2Fwiki%2FLys"><span>Hent forkortet URL</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Speciel:QrCode&url=https%3A%2F%2Fda.wikipedia.org%2Fwiki%2FLys"><span>Download QR-kode</span></a></li> </ul> </div> </div> <div id="p-Organisation" class="vector-menu mw-portlet mw-portlet-Organisation" > <div class="vector-menu-heading"> Organisation </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-contact" class="mw-list-item"><a href="/wiki/Wikipedia:Kontakt_Wikipedia"><span>Kontakt Wikipedia</span></a></li><li id="n-Wikimedia-Danmark" class="mw-list-item"><a href="https://dk.wikimedia.org/wiki/"><span>Wikimedia Danmark</span></a></li><li id="n-GLAM" class="mw-list-item"><a href="/wiki/Wikipedia:GLAM"><span>GLAM</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> Udskriv/eksportér </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-create_a_book" class="mw-list-item"><a href="/w/index.php?title=Speciel:Bog&bookcmd=book_creator&referer=Lys"><span>Lav en bog</span></a></li><li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Speciel:DownloadAsPdf&page=Lys&action=show-download-screen"><span>Download som PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=Lys&printable=yes" title="Printervenlig udgave af denne side [p]" accesskey="p"><span>Udskriftsvenlig udgave</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> I andre projekter </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Light" hreflang="en"><span>Wikimedia Commons</span></a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q9128" title="Link til tilknyttet emne i Wikidata [g]" accesskey="g"><span>Wikidata-element</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Sideværktøjer"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Udseende"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Udseende</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">flyt til sidebjælken</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">skjul</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Fra Wikipedia, den frie encyklopædi</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="da" dir="ltr"><dl><dd><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Disambig_bordered_fade.svg/19px-Disambig_bordered_fade.svg.png" decoding="async" width="19" height="15" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Disambig_bordered_fade.svg/29px-Disambig_bordered_fade.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Disambig_bordered_fade.svg/38px-Disambig_bordered_fade.svg.png 2x" data-file-width="236" data-file-height="185" /></span></span><i> For alternative betydninger, se <a href="/wiki/Lys_(flertydig)" class="mw-disambig" title="Lys (flertydig)">Lys (flertydig)</a>.</i> <small>(<a href="/wiki/Speciel:Pr%C3%A6fiksindeks/Lys" title="Speciel:Præfiksindeks/Lys">Se også artikler, som begynder med Lys</a>)</small></dd></dl> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fil:Amplificateurs_de_lumi%C3%A8re_5044365484_l.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Amplificateurs_de_lumi%C3%A8re_5044365484_l.jpg/220px-Amplificateurs_de_lumi%C3%A8re_5044365484_l.jpg" decoding="async" width="220" height="170" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Amplificateurs_de_lumi%C3%A8re_5044365484_l.jpg/330px-Amplificateurs_de_lumi%C3%A8re_5044365484_l.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Amplificateurs_de_lumi%C3%A8re_5044365484_l.jpg/440px-Amplificateurs_de_lumi%C3%A8re_5044365484_l.jpg 2x" data-file-width="1024" data-file-height="791" /></a><figcaption>Lys fra lamper</figcaption></figure> <p><b>Lys</b> betegner sædvanligvis den del af det <a href="/wiki/Elektromagnetiske_spektrum" title="Elektromagnetiske spektrum">elektromagnetiske spektrum</a> som er synligt for det menneskelige <a href="/wiki/%C3%98je" title="Øje">øje</a> ved hjælp af <a href="/wiki/Synssans" title="Synssans">synssansen</a>, kaldet <b>synligt lys</b>.<sup id="cite_ref-ici_1-0" class="reference"><a href="#cite_note-ici-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Det er normalt defineret som <a href="/wiki/Elektromagnetisk_str%C3%A5ling" title="Elektromagnetisk stråling">elektromagnetisk stråling</a> med <a href="/wiki/B%C3%B8lgel%C3%A6ngde" title="Bølgelængde">bølgelængder</a> mellem 400 og 700 <a href="/wiki/Nanometer" title="Nanometer">nanometer</a>, det vil sige mellem det <a href="/wiki/Infrar%C3%B8d_str%C3%A5ling" title="Infrarød stråling">infrarøde</a> og det <a href="/wiki/Ultraviolet_lys" title="Ultraviolet lys">ultraviolette</a>.<sup id="cite_ref-Pal2001_2-0" class="reference"><a href="#cite_note-Pal2001-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-BuserImbert1992_3-0" class="reference"><a href="#cite_note-BuserImbert1992-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p><p>Den væsentligste kilde til lys på <a href="/wiki/Jorden" title="Jorden">Jorden</a> er <a href="/wiki/Solen" title="Solen">solen</a>. Sollys tilvejebringer den energi som grønne <a href="/wiki/Planter" title="Planter">planter</a> anvender til at producere sukker, hvilket frigør energi for andre <a href="/wiki/Liv" title="Liv">levende væsener</a>, når de fordøjer dem. Historisk har en anden vigtig lyskilde for mennesker været <a href="/wiki/Ild" title="Ild">ild</a>, fra <a href="/wiki/B%C3%A5l" title="Bål">lejrbål</a> til moderne <a href="/wiki/Petroleumslampe" title="Petroleumslampe">petroleumslamper</a>. Dette blev erstattet af den <a href="/wiki/Lampe_(elektrisk)" title="Lampe (elektrisk)">elektriske lampe</a>, da <a href="/wiki/Elektricitet" title="Elektricitet">elektriciteten</a> blev almindelig udbredt. </p><p>Indenfor <a href="/wiki/Fysik" title="Fysik">fysik</a> betegner lys undertiden elektromagnetisk stråling af en hvilken som helst bølgelængde, hvad enten den er synlig eller ej.<sup id="cite_ref-Hallock_4-0" class="reference"><a href="#cite_note-Hallock-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Kumar_5-0" class="reference"><a href="#cite_note-Kumar-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> I denne betydning er <a href="/wiki/Gammastr%C3%A5ling" title="Gammastråling">gammastråler</a>, <a href="/wiki/R%C3%B8ntgenstr%C3%A5ling" title="Røntgenstråling">røntgenstråler</a>, <a href="/wiki/Mikrob%C3%B8lge" title="Mikrobølge">mikrobølger</a> og <a href="/wiki/Radiob%C3%B8lger" title="Radiobølger">radiobølger</a> også lys. Som alle typer lys udsendes og absorberes synligt lys som små "pakker" kaldet <a href="/wiki/Foton" title="Foton">fotoner</a> og udviser både <a href="/wiki/B%C3%B8lge" title="Bølge">bølge</a>- og <a href="/wiki/Partikel_(fysik)" title="Partikel (fysik)">partikel</a>egenskaber. Dette kaldes <a href="/wiki/Partikel-b%C3%B8lge_dualitet" class="mw-redirect" title="Partikel-bølge dualitet">partikel-bølge-dualiteten</a>. Studiet af lys, kendt som <a href="/wiki/Optik" title="Optik">optik</a>, er et vigtigt forskningsområde inden for <a href="/wiki/Fysik" title="Fysik">fysik</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Historie">Historie</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Lys&veaction=edit&section=1" title="Redigér afsnit: Historie" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Lys&action=edit&section=1" title="Edit section's source code: Historie"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fil:Ole_R%C3%B8mer_(Coning_painting).jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/1e/Ole_R%C3%B8mer_%28Coning_painting%29.jpg/220px-Ole_R%C3%B8mer_%28Coning_painting%29.jpg" decoding="async" width="220" height="270" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/1e/Ole_R%C3%B8mer_%28Coning_painting%29.jpg/330px-Ole_R%C3%B8mer_%28Coning_painting%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/1/1e/Ole_R%C3%B8mer_%28Coning_painting%29.jpg 2x" data-file-width="408" data-file-height="500" /></a><figcaption>Danskeren Ole Rømer (1644-1710) fandt ud af, at lyset har en endelig hastighed</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fil:Hippolyte_Fizeau.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Hippolyte_Fizeau.jpg/220px-Hippolyte_Fizeau.jpg" decoding="async" width="220" height="259" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Hippolyte_Fizeau.jpg/330px-Hippolyte_Fizeau.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/5/5d/Hippolyte_Fizeau.jpg 2x" data-file-width="400" data-file-height="470" /></a><figcaption>Franskmanden Hippolyte Armand Fizeau var en af de første, der målte lysets hastighed.</figcaption></figure> <p>Indtil langt ind i den moderne tid var det uklart, hvad lys faktisk er. Man troede delvist at lyset udfylder rummet uden tidsforsinkelse, og at man kigger på omgivelserne ved hjælp af "stråler", der udgår fra øjet. Der har dog allerede siden <a href="/wiki/Antikken" title="Antikken">antikken</a> været forestillinger om, at lyset blev udsendt fra lyskilden med en endelig hastighed. </p><p><a href="/wiki/Galileo_Galilei" title="Galileo Galilei">Galileo Galilei</a> forsøgte som en af de første seriøst at måle <a href="/wiki/Lysets_hastighed" title="Lysets hastighed">lysets udbredelseshastighed</a>, men uden succes. Dette lykkedes først på basis af <a href="/wiki/Ole_R%C3%B8mer" title="Ole Rømer">Ole Rømers</a> observationer af Jupiters måne <a href="/wiki/Io_(m%C3%A5ne)" title="Io (måne)">Io</a> i 1676. Han beregnede, at lyset var omkring 11 minutter om at bevæge sig 1 <a href="/wiki/Astronomisk_enhed" title="Astronomisk enhed">astronomisk enhed</a> (afstanden mellem jorden og solen), hvilket nu vides at være 8,3 minutter.<sup id="cite_ref-lh_6-0" class="reference"><a href="#cite_note-lh-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Bestemmelsen af lysets hastighed blev i løbet af de næste 200 år mere og mere præcis ved hælp af mere raffinerede metoder, især af franskmændene <a href="/wiki/Hippolyte_Fizeau" title="Hippolyte Fizeau">Fizeau</a> og <a href="/wiki/L%C3%A9on_Foucault" title="Léon Foucault">Foucault</a>. </p><p>Lysets natur forblev dog uforklaret. I slutningen af det <a href="/wiki/17._%C3%A5rhundrede" title="17. århundrede">17. århundrede</a> forsøgte <a href="/wiki/Isaac_Newton" title="Isaac Newton">Isaac Newton</a> at forklare lysets udbredelse ud fra eksistensen af små partikler.<sup id="cite_ref-in_7-0" class="reference"><a href="#cite_note-in-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> Dette kunne forklare <a href="/wiki/Refleksion_(fysik)" title="Refleksion (fysik)">refleksion</a>, men ikke visse andre optiske fænomener som <a href="/wiki/Diffraktion" title="Diffraktion">diffraktion</a>, der entydigt er et bølgefænomen. Samtidig grundlagde <a href="/wiki/Christiaan_Huygens" title="Christiaan Huygens">Christiaan Huygens</a> og andre bølgeteorien for lys, der først efterhånden blev anerkendt efter <a href="/wiki/Thomas_Young" title="Thomas Young">Thomas Youngs</a> <a href="/wiki/Dobbeltspalte-eksperiment" title="Dobbeltspalte-eksperiment">dobbeltspalte-eksperimenter</a> i begyndelsen af det <a href="/wiki/19._%C3%A5rhundrede" title="19. århundrede">19. århundrede</a>. </p><p><a href="/wiki/Michael_Faraday" title="Michael Faraday">Michael Faraday</a> beviste i <a href="/wiki/1846" title="1846">1846</a> som den første, at lys og <a href="/wiki/Magnetisme" title="Magnetisme">magnetisme</a> er to forbundne fysiske fænomener. Han offentliggjorde det, der i dag kaldes <a href="/wiki/Faradayeffekten" title="Faradayeffekten">faradayeffekten</a>, under titlen <i>On the magnetization of light and the illumination of magnetic lines of force</i>.<sup id="cite_ref-mf_8-0" class="reference"><a href="#cite_note-mf-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p><p><a href="/wiki/James_Clerk_Maxwell" title="James Clerk Maxwell">James Clerk Maxwell</a> formulerede i <a href="/wiki/1864" title="1864">1864</a> inden for <a href="/wiki/Elektrodynamik" class="mw-redirect" title="Elektrodynamik">elektrodynamik</a> de såkaldte <a href="/wiki/Maxwells_ligninger" title="Maxwells ligninger">Maxwell-ligninger</a>, der stadig er gyldige i dag, og han forstod, at der måtte eksistere elektromagnetiske bølger. Da disse bølgers forudsagte udbredelseshastighed stemte overens med den allerede kendte lyshastighed, kunne han slutte, at lyset vel måtte være en elektromagnetisk bølge. Han formodede (som de fleste fysikere dengang), at denne bølge ikke kunne eksistere i det tomme rum, men behøvede et udbredelsesmedium. Dette medium, der måtte udfylde hele verdensrummet, blev betegnet som <a href="/wiki/%C3%86ter_(fysikhistorie)" title="Æter (fysikhistorie)">æter</a>. </p><p>Efterhånden som man fik opbygget den <i>elektromagnetiske lysteori</i> lod det ved udgangen af det 19. århundrede til, at næsten alle spørgsmål angående lys var blevet besvaret. Ganske vist kunne man ikke eftervise den postulerede æter (se <a href="/wiki/Michelson-Morley_eksperimentet" class="mw-redirect" title="Michelson-Morley eksperimentet">Michelson-Morley eksperimentet</a>), hvilket i sidste ende åbnede døren for den <a href="/wiki/Speciel_relativitetsteori" title="Speciel relativitetsteori">specielle relativitetsteori</a>. Desuden lod bl.a. den <a href="/wiki/Fotoelektrisk_effekt" title="Fotoelektrisk effekt">fotoelektriske effekt</a> til at modsige lysets bølgenatur. Af den grund opstod en radikal ny måde at betragte lys på, der blev grundlagt af <a href="/wiki/Max_Planck" title="Max Planck">Max Planck</a> og <a href="/wiki/Albert_Einstein" title="Albert Einstein">Albert Einstein</a> ud fra teorien om at energien var <a href="/wiki/Kvantemekanikkens_historie" title="Kvantemekanikkens historie">kvantiseret</a>. Central i denne teori er <a href="/wiki/Partikel-b%C3%B8lge_dualitet" class="mw-redirect" title="Partikel-bølge dualitet">partikel-bølge-dualiteten</a>, hvor lyset ikke længere beskrives som enten bølge eller partikel, men derimod som kvanteobjekt. Denne <a href="/wiki/Dualisme" title="Dualisme">dualitet</a> forener bølge- og partikelegenskaberne uden at være hverken det ene eller det andet. Deraf opstod i begyndelsen af det <a href="/wiki/20._%C3%A5rhundrede" title="20. århundrede">20. århundrede</a> <a href="/wiki/Kvantemekanik" title="Kvantemekanik">kvantefysikken</a> og senere <a href="/wiki/Kvanteelektrodynamik" title="Kvanteelektrodynamik">kvanteelektrodynamikken</a>, der i dag udgør vores forståelse af lysets natur. </p> <div class="mw-heading mw-heading2"><h2 id="Lysets_egenskaber">Lysets egenskaber</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Lys&veaction=edit&section=2" title="Redigér afsnit: Lysets egenskaber" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Lys&action=edit&section=2" title="Edit section's source code: Lysets egenskaber"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>De primære egenskaber ved synligt lys er <a href="/wiki/Intensitet_(fysik)" title="Intensitet (fysik)">intensitet</a>, udbredelsesretning, <a href="/wiki/Frekvens" title="Frekvens">frekvens</a> eller <a href="/wiki/B%C3%B8lgel%C3%A6ngde" title="Bølgelængde">bølgelængde</a> og <a href="/wiki/Optisk_polarisering" class="mw-redirect" title="Optisk polarisering">polarisering</a>. </p><p>Lys har såvel bølgeegenskaber som partikelegenskaber. Bølgeegenskaberne viser sig bl.a. i situationer hvor lyset afbøjes, f.eks. i et <a href="/wiki/Diffraktivt_gitter_(optisk)" title="Diffraktivt gitter (optisk)">optisk gitter</a>. Afbøjningen i et gitter beskrives bedst ved at tænke på lys som bølger, der kan <a href="/wiki/Interferens" title="Interferens">interferere</a>. Partikelegenskaberne viser sig bl.a. i situationer hvor lys <a href="/wiki/Absorption" title="Absorption">absorberes</a> eller emitteres, f.eks. ved vekselvirkning med et <a href="/wiki/Atom" title="Atom">atom</a>, et <a href="/wiki/Molekyle" title="Molekyle">molekyle</a> eller et <a href="/wiki/Fase_(stof)" title="Fase (stof)">faststof</a>. Vekselvirkninger mellem lys og stof beskrives bedst ved at tænke på lys som partikler, såkaldte <a href="/wiki/Foton" title="Foton">fotoner</a>. </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fil:Fizeau.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Fizeau.JPG/220px-Fizeau.JPG" decoding="async" width="220" height="166" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Fizeau.JPG/330px-Fizeau.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/4/4c/Fizeau.JPG 2x" data-file-width="341" data-file-height="257" /></a><figcaption>Skematisk tegning af Fizeaus opstilling til bestemmelse af lysets hastighed.</figcaption></figure> <div class="mw-heading mw-heading3"><h3 id="Hastighed">Hastighed</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Lys&veaction=edit&section=3" title="Redigér afsnit: Hastighed" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Lys&action=edit&section=3" title="Edit section's source code: Hastighed"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="detail"><span><span typeof="mw:File"><span title="Uddybende"><img alt="Uddybende" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/61/Searchtool.svg/15px-Searchtool.svg.png" decoding="async" width="15" height="15" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/61/Searchtool.svg/23px-Searchtool.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/61/Searchtool.svg/30px-Searchtool.svg.png 2x" data-file-width="512" data-file-height="512" /></span></span> <span>Uddybende artikel: <a href="/wiki/Lysets_hastighed" title="Lysets hastighed">Lysets hastighed</a></span></span></div> <p>Elektromagnetisk stråling, og dermed også synlig lys, udbreder sig med en endelig hastighed. Alle iagttagere i jævn indbyrdes bevægelse vil ifølge den specielle <a href="/wiki/Relativitetsteori" title="Relativitetsteori">relativitetsteori</a> måle den samme hastighed, der i <a href="/wiki/Vakuum" title="Vakuum">vakuum</a> er 299.792.458 <a href="/wiki/Meter" title="Meter">meter</a> per <a href="/wiki/Sekund" title="Sekund">sekund</a>. </p><p>I <a href="/wiki/1676" title="1676">1676</a> opdagede <a href="/wiki/Ole_R%C3%B8mer" title="Ole Rømer">Ole Rømer</a>, at lyset "tøvede" ved observationer over en lang periode af <a href="/wiki/Jupiter_(planet)" title="Jupiter (planet)">Jupiter</a> og dens <a href="/wiki/Jupiters_m%C3%A5ner" title="Jupiters måner">måne</a> Io.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> Franskmanden <a href="/wiki/Hippolyte_Fizeau" title="Hippolyte Fizeau">Fizeau</a> (1819 – 1896) udførte som en af de første en måling af lysets hastighed i 1849. Han tog en kraftig og meget smal lysstråle, som sendtes ind mellem to tænder på et tandhjul og reflekteredes fra et <a href="/wiki/Spejl" title="Spejl">spejl</a> næsten 9 km væk. Spejlet anbragtes således, at lysstrålen reflekteredes præcist tilbage modsat sin oprindelige retning og ramte mellem de samme to tænder på tandhjulet. Efterfølgende bragtes tandhjulet til at rotere. Da strålen med jævne mellemrum blev afbrudt af hjulets tænder, blev lyset sendt af sted i korte glimt. Et ekstra halvgennemsigtigt spejl muliggjorde at se de tilbagekastede lysglimt. På et tidspunkt roterede tandhjulet så hurtigt, at hvert lysglimt ikke nåede at komme tilbage til samme hul i tandhjulet, men bremsedes af den efterfølgende tand, så der ikke længere kunne ses tilbagekastet lys mellem tænderne. Ud fra tandhjulets omdrejningsfrekvens og antallet af tænder samt lysets tilbagelagte afstand kunne lysets hastighed bestemmes.<sup id="cite_ref-Hughes2012_10-0" class="reference"><a href="#cite_note-Hughes2012-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> Vi ved dog nu, at den afveg cirka 5 procent fra den faktiske værdi, og allerede i <a href="/wiki/1728" title="1728">1728</a> havde <a href="/wiki/James_Bradley" title="James Bradley">James Bradley</a> bestemt lysets hastighed med 1 procents nøjagtighed ved hjælp af <a href="/w/index.php?title=Aberration_(astronomi)&action=edit&redlink=1" class="new" title="Aberration (astronomi) (ikke skrevet endnu)">aberrationen</a> af lyset fra stjernerne. Lysets hastighed blev dog bestemt nøjagtigere året efter i 1850 af <a href="/wiki/L%C3%A9on_Foucault" title="Léon Foucault">Léon Foucault</a> efter en lignende metode. </p> <div class="mw-heading mw-heading3"><h3 id="Brydning">Brydning</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Lys&veaction=edit&section=4" title="Redigér afsnit: Brydning" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Lys&action=edit&section=4" title="Edit section's source code: Brydning"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fil:Light_dispersion_conceptual_waves350px.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/Light_dispersion_conceptual_waves350px.gif/220px-Light_dispersion_conceptual_waves350px.gif" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/Light_dispersion_conceptual_waves350px.gif/330px-Light_dispersion_conceptual_waves350px.gif 1.5x, //upload.wikimedia.org/wikipedia/commons/7/73/Light_dispersion_conceptual_waves350px.gif 2x" data-file-width="350" data-file-height="263" /></a><figcaption>En prisme spreder en stråle af hvidt lys.</figcaption></figure> <p>Studiet af lysets opførsel under forskellige omstændigheder benævnes <a href="/wiki/Optik" title="Optik">optik</a>. Når lys f.eks. passerer gennemsigtige medier som <a href="/wiki/Luft" title="Luft">luft</a>, <a href="/wiki/Vand" title="Vand">vand</a> eller <a href="/wiki/Glas" title="Glas">glas</a>, vil lysets hastighed være mindre end i vakuum, svarende til en mindre bølgelængde. Som konsekvens heraf vil lyset <a href="/wiki/Refraktion" title="Refraktion">brydes</a>, dvs. ændre retning. <a href="/wiki/Brydningsindeks" title="Brydningsindeks">Brydningsindekset</a> er et mål for stoffets evne til at bryde lyset. Per definition er brydningsindekset forholdet mellem lysets hastighed i vakuum og lysets hastighed i mediet. </p> <table class="wikitable"> <tbody><tr> <td><b>Medium</b> </td> <td><b>Brydningsindeks</b> </td> <td><b>Lyshastighed i km/s</b> </td></tr> <tr> <td>Vakuum </td> <td>1,00000 </td> <td>299792,458 - <b>international standard</b> </td></tr> <tr> <td>Luft </td> <td>1,00029 </td> <td>299703 </td></tr> <tr> <td>Vand </td> <td>1,33 </td> <td>225408 </td></tr> <tr> <td>Vinduesglas </td> <td>1,50 </td> <td>199862 </td></tr> </tbody></table> <div class="mw-heading mw-heading2"><h2 id="Lys_som_sanseindtryk">Lys som sanseindtryk</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Lys&veaction=edit&section=5" title="Redigér afsnit: Lys som sanseindtryk" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Lys&action=edit&section=5" title="Edit section's source code: Lys som sanseindtryk"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fil:Eye_scheme_da.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d2/Eye_scheme_da.svg/220px-Eye_scheme_da.svg.png" decoding="async" width="220" height="182" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d2/Eye_scheme_da.svg/330px-Eye_scheme_da.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d2/Eye_scheme_da.svg/440px-Eye_scheme_da.svg.png 2x" data-file-width="632" data-file-height="522" /></a><figcaption>Skematisk længdesnit gennem det menneskelige øje</figcaption></figure> <p>Det lys, der falder ind i det menneskelige øje, rammer først <a href="/wiki/Hornhinde" title="Hornhinde">hornhinden</a>, fortsætter gennem <a href="/wiki/Pupil" title="Pupil">pupillen</a>, afbøjes af <a href="/wiki/Linse_(%C3%B8je)" class="mw-redirect" title="Linse (øje)">linsen</a> og <a href="/w/index.php?title=Projektion_(billede)&action=edit&redlink=1" class="new" title="Projektion (billede) (ikke skrevet endnu)">projiceres</a> gennem glaslegemet på <a href="/wiki/Nethinde" title="Nethinde">nethinden</a>, hvor der opstår et virkeligt billede, der står på hovedet. Dette svarer til, hvad der sker i et <a href="/wiki/Kamera" title="Kamera">kamera</a>. På nethinden bliver de lysfølsomme sanseceller (<a href="/wiki/Stav_(synet)" title="Stav (synet)">stave</a> og <a href="/wiki/Tap_(synet)" title="Tap (synet)">tappe</a>) stimuleret til at udsende et elektrisk signal, der går gennem <a href="/wiki/Synsnerve" title="Synsnerve">synsnerven</a> til <a href="/wiki/Hjerne" title="Hjerne">hjernen</a>, hvor opfattelsen finder sted. </p><p>Den <a href="/wiki/Farvesystem#Farvespektrum" title="Farvesystem">spektrale</a> sammensætning af lyset opfattes som <a href="/wiki/Farve" title="Farve">farve</a>. Hvis man opsplitter det hvide lys gennem et <a href="/wiki/Optisk_prisme" title="Optisk prisme">prisme</a>, så ses de forskellige <a href="/wiki/B%C3%B8lgel%C3%A6ngde" title="Bølgelængde">bølgelængder</a> som <a href="/wiki/Regnbue" title="Regnbue">regnbuens</a> farver. </p><p>Bølgelængden af synligt lys ligger i intervallet fra ca. 380 <a href="/wiki/Nanometer" title="Nanometer">nm</a> til ca. 740 nm. Hvis lyset splittes op i smalle <a href="/wiki/Frekvens" title="Frekvens">frekvens</a>-bånd (bølgelængdeintervaller), vil de af ikke-<a href="/wiki/Farveblindhed" title="Farveblindhed">farveblinde</a> mennesker blive opfattet som <a href="/wiki/Farve" title="Farve">farver</a> spændende fra <a href="/wiki/R%C3%B8d" title="Rød">rød</a> (omkring 740 nm) til <a href="/wiki/Violet" title="Violet">violet</a> (omkring 380 nm). De mellemliggende bølgelængder ses som <a href="/wiki/Orange" title="Orange">orange</a>, <a href="/wiki/Gul" title="Gul">gul</a>, <a href="/wiki/Gr%C3%B8n" title="Grøn">grøn</a>, <a href="/wiki/Bl%C3%A5" title="Blå">blå</a> og <a href="/wiki/Indigo" title="Indigo">indigo</a>. </p><p>Mere kortbølget stråling kaldes ultraviolet lys eller <a href="/wiki/Ultraviolet_lys" title="Ultraviolet lys">UV</a>, og mere langbølget stråling kaldes infrarødt lys eller <a href="/wiki/Infrar%C3%B8d_str%C3%A5ling" title="Infrarød stråling">IR</a>. I huden findes receptorer, der kan registrere infrarød stråling og videregive dette som en følelse af <a href="/wiki/Varme" title="Varme">varme</a>. I huden findes endvidere <a href="/wiki/Pigment" title="Pigment">pigment</a> som aktiveres, når huden udsættes for ultraviolet lys. Nogle dyr, f.eks. <a href="/wiki/Bier_(Apiformes)" title="Bier (Apiformes)">bier</a>, kan se ultraviolet lys, mens andre dyr, f.eks. <a href="/wiki/Klapperslanger" title="Klapperslanger">klapperslanger</a>, kan se infrarødt lys. </p> <table border="1" cellspacing="0" cellpadding="2"> <tbody><tr> <th>Farve </th> <th>Bølgelængde i <a href="/wiki/Nanometer" title="Nanometer">nm</a> </th> <th>Frekvens i <a href="/wiki/Terahertz" title="Terahertz">THz</a> </th></tr> <tr> <td bgcolor="#DF0000"><span style="color:white;">rød</span> </td> <td bgcolor="#DF0000" align="center"><span style="color:white;">625-740</span> </td> <td bgcolor="#DF0000" align="center"><span style="color:white;">480-405</span> </td></tr> <tr> <td bgcolor="#FF8000"><span style="color:white;">orange</span> </td> <td bgcolor="#FF8000" align="center"><span style="color:white;">590-625</span> </td> <td bgcolor="#FF8000" align="center"><span style="color:white;">510-480</span> </td></tr> <tr> <td bgcolor="#FFFF00"><span style="color:black;">gul</span> </td> <td bgcolor="#FFFF00" align="center"><span style="color:black;">565-590</span> </td> <td bgcolor="#FFFF00" align="center"><span style="color:black;">530-510</span> </td></tr> <tr> <td bgcolor="#00FF00"><span style="color:white;">grøn</span> </td> <td bgcolor="#00FF00" align="center"><span style="color:white;">520-565</span> </td> <td bgcolor="#00FF00" align="center"><span style="color:white;">580-530</span> </td></tr> <tr> <td bgcolor="#00D4D4"><span style="color:white;">cyan</span> </td> <td bgcolor="#00D4D4" align="center"><span style="color:white;">500-520</span> </td> <td bgcolor="#00D4D4" align="center"><span style="color:white;">600-580</span> </td></tr> <tr> <td bgcolor="#0000FF"><span style="color:white;">blå</span> </td> <td bgcolor="#0000FF" align="center"><span style="color:white;">450-500</span> </td> <td bgcolor="#0000FF" align="center"><span style="color:white;">670-600</span> </td></tr> <tr> <td bgcolor="#0000AF"><span style="color:white;">indigo</span> </td> <td bgcolor="#0000AF" align="center"><span style="color:white;">430-450</span> </td> <td bgcolor="#0000AF" align="center"><span style="color:white;">700-670</span> </td></tr> <tr> <td bgcolor="#50007F"><span style="color:white;">violet</span> </td> <td bgcolor="#50007F" align="center"><span style="color:white;">380-430</span> </td> <td bgcolor="#50007F" align="center"><span style="color:white;">790-700</span> </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="Lyskilder">Lyskilder</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Lys&veaction=edit&section=6" title="Redigér afsnit: Lyskilder" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Lys&action=edit&section=6" title="Edit section's source code: Lyskilder"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/Fil:Night_yamagata_city_2.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/78/Night_yamagata_city_2.jpg/250px-Night_yamagata_city_2.jpg" decoding="async" width="250" height="199" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/78/Night_yamagata_city_2.jpg/375px-Night_yamagata_city_2.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/78/Night_yamagata_city_2.jpg/500px-Night_yamagata_city_2.jpg 2x" data-file-width="900" data-file-height="717" /></a><figcaption>En <a href="/wiki/By" title="By">by</a> oplyst af kunstig <a href="/wiki/Belysning" title="Belysning">belysning</a>.</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fil:Spectral-lines-continuous.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/19/Spectral-lines-continuous.svg/220px-Spectral-lines-continuous.svg.png" decoding="async" width="220" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/19/Spectral-lines-continuous.svg/330px-Spectral-lines-continuous.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/19/Spectral-lines-continuous.svg/440px-Spectral-lines-continuous.svg.png 2x" data-file-width="335" data-file-height="40" /></a><figcaption>Kontinuert spektrum</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fil:Spectral-lines-emission.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/de/Spectral-lines-emission.svg/220px-Spectral-lines-emission.svg.png" decoding="async" width="220" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/de/Spectral-lines-emission.svg/330px-Spectral-lines-emission.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/de/Spectral-lines-emission.svg/440px-Spectral-lines-emission.svg.png 2x" data-file-width="335" data-file-height="40" /></a><figcaption>Linjespektrum (emissionsspektrum for <a href="/wiki/Brint" title="Brint">brint</a>)</figcaption></figure> <p>Der findes mange kilder til lys. De mest almindelige lyskilder er <a href="/wiki/Termisk_energi" title="Termisk energi">termiske</a>: et <a href="/wiki/Legeme_(fysik)" title="Legeme (fysik)">legeme</a> med en given <a href="/wiki/Temperatur" title="Temperatur">temperatur</a> udsender et karakteristisk spektrum af <a href="/wiki/Sortlegeme" title="Sortlegeme">sortlegeme</a>-stråling. En simpel termisk kilde er <a href="/wiki/Sollys" title="Sollys">sollys</a>, strålingen fra <a href="/wiki/Solen" title="Solen">solens</a> <a href="/wiki/Kromosf%C3%A6re" title="Kromosfære">kromosfære</a> ved omkring 6000 <a href="/wiki/Kelvin" title="Kelvin">kelvin</a> (5730 °<a href="/wiki/Celsius" title="Celsius">C</a>) topper i den synlige del af det elektromagnetiske spektrum. <sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> og groft regnet 44% af sollyset, der når jorden er synligt.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> Et andet eksempel er <a href="/wiki/Gl%C3%B8delampe" title="Glødelampe">glødelamper</a>, der udsender cirka 3-6% af deres energi som synligt lys og resten som infrarød. Tidligere i historien var en almindelig termisk lyskilde <a href="/wiki/Flamme" title="Flamme">flammerne</a> fra glødende faste partikler (f.eks. <a href="/wiki/Br%C3%A6nde" title="Brænde">brænde</a> eller <a href="/wiki/Stearinlys" class="mw-redirect" title="Stearinlys">stearinlys</a>), men de udsender også det meste af deres energi som infrarød stråling og kun en smule i det synlige spektrum. For relativt kolde legemer som mennesker topper sortlegeme-spektret i dyb infrarød ved en bølgelængde på omkring 10 mikrometer. Ved højere temperaturer topper spektret ved kortere bølgelængder, først rød, så hvid og til slut en blåhvid farve, inden toppen bevæger sig ud af den synlige del af spektret og ind i den ultraviolette del. Disse farver kan ses, når <a href="/wiki/Metal" title="Metal">metal</a> opvarmes til rødglødende eller hvidglødende. Blåhvid termisk emission ses ikke ofte, bortset fra i <a href="/wiki/Stjerne" title="Stjerne">stjerner</a>. Den ofte sete renblå farve i flammen af <a href="/wiki/Naturgas" title="Naturgas">gas</a> eller i en <a href="/wiki/Svejsning" title="Svejsning">svejseflamme</a> skyldes en molekylær emission og ses ikke i stjerner. </p><p><a href="/wiki/Atom" title="Atom">Atomer</a> emitterer og absorberer lys med en karakteristisk energi. Dette skaber "emissionslinjer" i hvert atoms spektrum. Emissionen kan være <a href="/wiki/Spontan_emission" title="Spontan emission">spontan</a> som i <a href="/wiki/Lysdiode" title="Lysdiode">lysdioder</a>, <a href="/wiki/Polarlys" title="Polarlys">polarlys</a>, <a href="/wiki/Gasudladningslamper" class="mw-redirect" title="Gasudladningslamper">gasudladningslamper</a> (<a href="/wiki/Neonlampe" class="mw-redirect" title="Neonlampe">neonlamper</a> og <a href="/wiki/Neonskilt" class="mw-redirect" title="Neonskilt">neonskilte</a>, <a href="/w/index.php?title=Kviks%C3%B8lvlampe&action=edit&redlink=1" class="new" title="Kviksølvlampe (ikke skrevet endnu)">kviksølvlamper</a> osv.) og flammer (lys fra selve den varme gas, f.eks. udsender <a href="/wiki/Natrium" title="Natrium">natrium</a> i en gasflamme et karakteristisk gult lys). Emissionen kan også være <a href="/wiki/Stimuleret_emission" title="Stimuleret emission">stimuleret</a> som i en <a href="/wiki/Laser" title="Laser">laser</a> eller en <a href="/wiki/Maser" title="Maser">maser</a>. </p><p>Acceleration af frie <a href="/wiki/Ladet_partikel" title="Ladet partikel">ladede partikler</a> (f.eks. <a href="/wiki/Elektron" title="Elektron">elektroner</a>) kan frembringe synligt lys, f.eks <a href="/wiki/Bremsestr%C3%A5ling" title="Bremsestråling">bremsestråling</a>. Partikler, der bevæger sig gennem et medium hurtigere end lystes hastighed i det medium (er ikke endeligt bekræftet) kan frembringe synlig <a href="/wiki/Tjerenkovstr%C3%A5ling" class="mw-redirect" title="Tjerenkovstråling">tjerenkovstråling</a>. </p><p>Visse <a href="/wiki/Kemisk_reaktion" title="Kemisk reaktion">kemiske reaktioner</a> skaber synligt lys. I levende organismer kaldes dette for <a href="/wiki/Bioluminescens" title="Bioluminescens">bioluminescens</a>, f.eks hos <a href="/wiki/Ildfluer" title="Ildfluer">ildfluer</a>. Visse stoffer frembringer lys, når de er udsat for mere energirig stråling ved en proces kendt som <a href="/wiki/Fluorescens" title="Fluorescens">fluorescens</a>. Nogle stoffer udsender lys efter excitation med mere energirig stråling. Dette er kendt som <a href="/wiki/Fosforescens" class="mw-redirect" title="Fosforescens">fosforescens</a>. Fosforescerende materialer kan også exciteres ved at bombardere dem med <a href="/wiki/Subatomar_partikel" title="Subatomar partikel">subatomare</a> partikler. Denne mekanisme anvendes i <a href="/wiki/Fjernsyn" title="Fjernsyn">fjernsyn</a> og <a href="/wiki/Computersk%C3%A6rm" class="mw-redirect" title="Computerskærm">computerskærme</a> med <a href="/wiki/Katodestr%C3%A5ler%C3%B8r" class="mw-redirect" title="Katodestrålerør">katodestrålerør</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Måling_af_lys"><span id="M.C3.A5ling_af_lys"></span>Måling af lys</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Lys&veaction=edit&section=7" title="Redigér afsnit: Måling af lys" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Lys&action=edit&section=7" title="Edit section's source code: Måling af lys"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Nogle relevante størrelser for studiet af lysfænomener: </p> <ul><li><a href="/wiki/Lysstyrke" title="Lysstyrke">Lysstyrke</a> (<a href="/wiki/Syst%C3%A8me_International_d%27Unit%C3%A9s" class="mw-redirect" title="Système International d'Unités">SI</a>-enhed: <a href="/wiki/Candela" title="Candela">candela</a>)</li> <li><a href="/wiki/Belysning" title="Belysning">Belysning</a> (<a href="/wiki/Syst%C3%A8me_International_d%27Unit%C3%A9s" class="mw-redirect" title="Système International d'Unités">SI</a>-enhed: <a href="/wiki/Lux" title="Lux">lux</a>)</li> <li><a href="/w/index.php?title=Lysstr%C3%B8m&action=edit&redlink=1" class="new" title="Lysstrøm (ikke skrevet endnu)">Lysstrøm</a> (<a href="/wiki/Syst%C3%A8me_International_d%27Unit%C3%A9s" class="mw-redirect" title="Système International d'Unités">SI</a>-enhed: <a href="/wiki/Lumen" title="Lumen">lumen</a>)</li> <li><a href="/wiki/Farvetemperatur" title="Farvetemperatur">Farvetemperatur</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Se_også"><span id="Se_ogs.C3.A5"></span>Se også</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Lys&veaction=edit&section=8" title="Redigér afsnit: Se også" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Lys&action=edit&section=8" title="Edit section's source code: Se også"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Biologisk_ur" title="Biologisk ur">Biologisk ur</a></li> <li><a href="/wiki/Sollys" title="Sollys">Sollys</a></li> <li><a href="/wiki/Luxmeter" title="Luxmeter">Luxmeter</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Noter">Noter</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Lys&veaction=edit&section=9" title="Redigér afsnit: Noter" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Lys&action=edit&section=9" title="Edit section's source code: Noter"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r11780210">.mw-parser-output .reflist{font-size:90%;margin-bottom:0.5em;list-style-type:decimal}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-ici-1"><span class="mw-cite-backlink"><a href="#cite_ref-ici_1-0">^</a></span> <span class="reference-text">International Commission on Illumination (1987). <a rel="nofollow" class="external text" href="http://www.cie.co.at/publ/abst/17-4-89.html"><i>International Lighting Vocabulary</i></a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20100227034508/http://www.cie.co.at/publ/abst/17-4-89.html">Arkiveret</a> 27. februar 2010 hos <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>. Number 17.4. CIE, 4th edition. <a href="/wiki/Internationalt_Standardbognummer" title="Internationalt Standardbognummer">ISBN</a> <a href="/wiki/Speciel:ISBN-s%C3%B8gning/978-3-900734-07-7" title="Speciel:ISBN-søgning/978-3-900734-07-7">978-3-900734-07-7</a>.<br />Definition af lys: “Any radiation capable of causing a visual sensation directly.”</span> </li> <li id="cite_note-Pal2001-2"><span class="mw-cite-backlink"><a href="#cite_ref-Pal2001_2-0">^</a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r11752076">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free a,.mw-parser-output .citation .cs1-lock-free a{background:linear-gradient(transparent,transparent),url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited a,.mw-parser-output .id-lock-registration a,.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:linear-gradient(transparent,transparent),url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription a,.mw-parser-output .citation .cs1-lock-subscription a{background:linear-gradient(transparent,transparent),url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:linear-gradient(transparent,transparent),url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:#d33}.mw-parser-output .cs1-visible-error{color:#d33}.mw-parser-output .cs1-maint{display:none;color:#3a3;margin-left:0.3em}.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}</style><cite id="CITEREFPalPal2001" class="citation book cs1">Pal, G. K.; Pal, Pravati (2001). "chapter 52". <a rel="nofollow" class="external text" href="https://books.google.com/books?id=CcJvIiesqp8C&pg=PA387"><i>Textbook of Practical Physiology</i></a> (1st udgave). Chennai: Orient Blackswan. s. 387. <a href="/wiki/Internationalt_Standardbognummer" title="Internationalt Standardbognummer">ISBN</a> <a href="/wiki/Speciel:ISBN-s%C3%B8gning/978-81-250-2021-9" title="Speciel:ISBN-søgning/978-81-250-2021-9"><bdi>978-81-250-2021-9</bdi></a><span class="reference-accessdate">. Hentet 1. april 2016</span>. <q>The human eye has the ability to respond to all the wavelengths of light from 400–700 nm. This is called the visible part of the spectrum.</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=chapter+52&rft.btitle=Textbook+of+Practical+Physiology&rft.place=Chennai&rft.pages=387&rft.edition=1st&rft.pub=Orient+Blackswan&rft.date=2001&rft.isbn=978-81-250-2021-9&rft.aulast=Pal&rft.aufirst=G.+K.&rft.au=Pal%2C+Pravati&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DCcJvIiesqp8C%26pg%3DPA387&rfr_id=info%3Asid%2Fda.wikipedia.org%3ALys" class="Z3988"></span></span> </li> <li id="cite_note-BuserImbert1992-3"><span class="mw-cite-backlink"><a href="#cite_ref-BuserImbert1992_3-0">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite id="CITEREFBuserImbert1992" class="citation book cs1">Buser, Pierre A.; Imbert, Michel (1992). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=NSZvt8Ld2-8C&pg=PA50"><i>Vision</i></a>. MIT Press. s. 50. <a href="/wiki/Internationalt_Standardbognummer" title="Internationalt Standardbognummer">ISBN</a> <a href="/wiki/Speciel:ISBN-s%C3%B8gning/978-0-262-02336-8" title="Speciel:ISBN-søgning/978-0-262-02336-8"><bdi>978-0-262-02336-8</bdi></a><span class="reference-accessdate">. Hentet 1. april 2016</span>. <q>Light is a special class of radiant energy embracing wavelengths between 400 and 700 nm (or mμ), or 4000 to 7000 Å.</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Vision&rft.pages=50&rft.pub=MIT+Press&rft.date=1992&rft.isbn=978-0-262-02336-8&rft.aulast=Buser&rft.aufirst=Pierre+A.&rft.au=Imbert%2C+Michel&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DNSZvt8Ld2-8C%26pg%3DPA50&rfr_id=info%3Asid%2Fda.wikipedia.org%3ALys" class="Z3988"></span></span> </li> <li id="cite_note-Hallock-4"><span class="mw-cite-backlink"><a href="#cite_ref-Hallock_4-0">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite id="CITEREFGregory_Hallock_Smith2006" class="citation book cs1">Gregory Hallock Smith (2006). <a rel="nofollow" class="external text" href="https://books.google.com/?id=6mb0C0cFCEYC&pg=PA4"><i>Camera lenses: from box camera to digital</i></a>. SPIE Press. s. 4. <a href="/wiki/Internationalt_Standardbognummer" title="Internationalt Standardbognummer">ISBN</a> <a href="/wiki/Speciel:ISBN-s%C3%B8gning/978-0-8194-6093-6" title="Speciel:ISBN-søgning/978-0-8194-6093-6"><bdi>978-0-8194-6093-6</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Camera+lenses%3A+from+box+camera+to+digital&rft.pages=4&rft.pub=SPIE+Press&rft.date=2006&rft.isbn=978-0-8194-6093-6&rft.au=Gregory+Hallock+Smith&rft_id=https%3A%2F%2Fbooks.google.com%2F%3Fid%3D6mb0C0cFCEYC%26pg%3DPA4&rfr_id=info%3Asid%2Fda.wikipedia.org%3ALys" class="Z3988"></span></span> </li> <li id="cite_note-Kumar-5"><span class="mw-cite-backlink"><a href="#cite_ref-Kumar_5-0">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite id="CITEREFNarinder_Kumar2008" class="citation book cs1">Narinder Kumar (2008). <a rel="nofollow" class="external text" href="https://books.google.com/?id=IryMtwHHngIC&pg=PA1416"><i>Comprehensive Physics XII</i></a>. Laxmi Publications. s. 1416. <a href="/wiki/Internationalt_Standardbognummer" title="Internationalt Standardbognummer">ISBN</a> <a href="/wiki/Speciel:ISBN-s%C3%B8gning/978-81-7008-592-8" title="Speciel:ISBN-søgning/978-81-7008-592-8"><bdi>978-81-7008-592-8</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Comprehensive+Physics+XII&rft.pages=1416&rft.pub=Laxmi+Publications&rft.date=2008&rft.isbn=978-81-7008-592-8&rft.au=Narinder+Kumar&rft_id=https%3A%2F%2Fbooks.google.com%2F%3Fid%3DIryMtwHHngIC%26pg%3DPA1416&rfr_id=info%3Asid%2Fda.wikipedia.org%3ALys" class="Z3988"></span></span> </li> <li id="cite_note-lh-6"><span class="mw-cite-backlink"><a href="#cite_ref-lh_6-0">^</a></span> <span class="reference-text">www.fysikhistorie.dk <a rel="nofollow" class="external text" href="http://www.fysikhistorie.dk/merer2/roemmer.html">Ole Rømer og lyshastigheden</a> Hentet 5. april 2016.</span> </li> <li id="cite_note-in-7"><span class="mw-cite-backlink"><a href="#cite_ref-in_7-0">^</a></span> <span class="reference-text">www.fysikhistorie.dk <a rel="nofollow" class="external text" href="http://www.fysikhistorie.dk/merer3/newlysmer.html">Newtons teori om lysets natur</a> Hentet 2. april 2016.</span> </li> <li id="cite_note-mf-8"><span class="mw-cite-backlink"><a href="#cite_ref-mf_8-0">^</a></span> <span class="reference-text">Michael Faraday: <i>Experimental Researches in Electricity. Nineteenth Series</i>. In: <i>Philosophical Transactions of the Royal Society</i>. Band 136, 1846, S. 1–20, <span class="noprint"><a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1098%2Frstl.1846.0001">10.1098/rstl.1846.0001</a></span>.</span> </li> <li id="cite_note-9"><span class="mw-cite-backlink"><a href="#cite_ref-9">^</a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://www.youtube.com/watch?v=DMKE5YGLnmc">Brian Cox (BBC) fortæller og viser om Ole Rømers måling</a></span> </li> <li id="cite_note-Hughes2012-10"><span class="mw-cite-backlink"><a href="#cite_ref-Hughes2012_10-0">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite id="CITEREFHughes2012" class="citation book cs1">Hughes, Stephan (2012). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20151029044434/https://books.google.com/books?id=iZk5OOf7fVYC&pg=PA202#v=onepage&q&f=false"><i>Catchers of the Light: The Forgotten Lives of the Men and Women Who First Photographed the Heavens</i></a>. ArtDeCiel Publishing. s. 202-223. Arkiveret fra <a rel="nofollow" class="external text" href="https://books.google.com/books?id=iZk5OOf7fVYC&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false">originalen</a> 28. oktober 2015<span class="reference-accessdate">. Hentet 2. april 2016</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Catchers+of+the+Light%3A+The+Forgotten+Lives+of+the+Men+and+Women+Who+First+Photographed+the+Heavens&rft.pages=202-223&rft.pub=ArtDeCiel+Publishing&rft.date=2012&rft.aulast=Hughes&rft.aufirst=Stephan&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DiZk5OOf7fVYC%26printsec%3Dfrontcover%26source%3Dgbs_ge_summary_r%26cad%3D0%23v%3Donepage%26q%26f%3Dfalse&rfr_id=info%3Asid%2Fda.wikipedia.org%3ALys" class="Z3988"></span></span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><a href="#cite_ref-11">^</a></span> <span class="reference-text"><a rel="nofollow" class="external free" href="http://thulescientific.com/LYNCH%20&%20Soffer%20OPN%201999.pdf">http://thulescientific.com/LYNCH%20&%20Soffer%20OPN%201999.pdf</a></span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><a href="#cite_ref-12">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://rredc.nrel.gov/solar/spectra/am1.5/">"Reference Solar Spectral Irradiance: Air Mass 1.5"</a><span class="reference-accessdate">. Hentet <span class="nowrap">2009-11-12</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Reference+Solar+Spectral+Irradiance%3A+Air+Mass+1.5&rft_id=http%3A%2F%2Frredc.nrel.gov%2Fsolar%2Fspectra%2Fam1.5%2F&rfr_id=info%3Asid%2Fda.wikipedia.org%3ALys" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="Eksterne_henvisninger">Eksterne henvisninger</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Lys&veaction=edit&section=10" title="Redigér afsnit: Eksterne henvisninger" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Lys&action=edit&section=10" title="Edit section's source code: Eksterne henvisninger"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="infobox sisterproject"> <tbody><tr> <td style="width:50px; height:67px;"><figure class="mw-halign-none" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/50px-Commons-logo.svg.png" decoding="async" width="50" height="67" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/75px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/100px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span><figcaption></figcaption></figure> </td> <td style="padding-left:5px;"><a href="https://commons.wikimedia.org/wiki/Forside" class="extiw" title="commons:Forside">Wikimedia Commons</a> har medier relateret til: <div style="margin-left: 10px;"> <i><b><a href="https://commons.wikimedia.org/wiki/Category:Light" class="extiw" title="commons:Category:Light">Lys</a></b></i></div> </td></tr></tbody></table> <ul><li><a rel="nofollow" class="external text" href="http://www.light2015.org/Home/LearnAboutLight/Lasers.htm">International Year of Light and Light-based Technologies</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20150619210108/http://www.light2015.org/Home/LearnAboutLight/Lasers.htm">Arkiveret</a> 19. juni 2015 hos <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a></li> <li><a rel="nofollow" class="external text" href="http://www.dmi.dk/nyheder/arkiv/nyheder-2015/06/se-lyset-paa-ryparken-station/">Se lyset på Ryparken Station. DMI</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20150619195933/http://www.dmi.dk/nyheder/arkiv/nyheder-2015/06/se-lyset-paa-ryparken-station/">Arkiveret</a> 19. juni 2015 hos <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a></li> <li>Ingeniøren, 19/08/01 Første hvide lysdiode: <i>"...Effekten skyldes en særlig form for eksitation først opdaget i 1994...De resulterende elektron-hul par, der nu omfatter begge molekyler, henfalder ved udsendelse af fotoner, hvis bølgelængder dækker hele det synlige spektrum...levetid vil være mange gange større end elektriske pærers... (App. Phys. Let. 30/7-01)"</i>.</li> <li><a rel="nofollow" class="external text" href="http://www.aip.org/enews/physnews/2001/split/523-2.html">Number 523 #2, February 1, 2001, AIP: How Light Gets Through Tiny Holes</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20040314123606/http://www.aip.org/enews/physnews/2001/split/523-2.html">Arkiveret</a> 14. marts 2004 hos <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a> Citat: "...Now, two research collaborations independently explain the results by showing that plasmons (themselves collective objects) and the <a href="/wiki/Foton" title="Foton">photons</a> of light form a composite object, known as a "surface plasmon polariton."..."</li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r11759279">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output 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title="Extremely Low Frequency">ELF</a></li> <li><a href="/wiki/SLF" class="mw-redirect" title="SLF">SLF</a></li> <li><a href="/wiki/ULF" title="ULF">ULF</a></li> <li><a href="/wiki/VLF" title="VLF">VLF</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Radiob%C3%B8lge" class="mw-redirect" title="Radiobølge">Radiobølger</a> (omfattet af <a href="/wiki/H%C3%B8jfrekvens_(radiofrekvens)" class="mw-redirect" title="Højfrekvens (radiofrekvens)">højfrekvens</a>)</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Langb%C3%B8lger" title="Langbølger">LF</a> (<a href="/wiki/Langb%C3%B8lgeb%C3%A5ndet" title="Langbølgebåndet">Langbølgebåndet</a>)</li> <li><a href="/wiki/Mellemb%C3%B8lger" title="Mellembølger">MF</a> (<a href="/wiki/Mellemb%C3%B8lgeb%C3%A5ndet" title="Mellembølgebåndet">Mellembølgebåndet</a>)</li> <li><a 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href="/wiki/Termisk_energi" title="Termisk energi">Termisk energi</a></li> <li><a href="/wiki/Fotosyntese" title="Fotosyntese">Fotosyntese</a></li> <li><a href="/wiki/Solenergi" title="Solenergi">Solenergi</a></li> <li><a href="/wiki/Solkraft" title="Solkraft">Solkraft</a></li> <li><a href="/wiki/Solvarme" class="mw-redirect" title="Solvarme">Solvarme</a></li> <li><a href="/wiki/Solen" title="Solen">Solen</a></li> <li><a href="/wiki/Radioantenne" title="Radioantenne">Radioantenne</a></li> <li><a href="/wiki/Radiofoni" class="mw-redirect" title="Radiofoni">Radiofoni</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11759279"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752089"></div><div role="navigation" class="navbox" aria-labelledby="Autoritetsdata" style="padding:3px"><table class="nowraplinks hlist navbox-inner" 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href="http://catalogue.bnf.fr/ark:/12148/cb119582471">cb119582471</a> <a rel="nofollow" class="external text" href="http://data.bnf.fr/ark:/12148/cb119582471">(data)</a></span></li> <li><a href="/wiki/Nationale_parlamentsbibliotek" title="Nationale parlamentsbibliotek">NDL</a>: <span class="uid"><a rel="nofollow" class="external text" href="http://id.ndl.go.jp/auth/ndlna/00563178">00563178</a></span></li> <li><a href="/wiki/Tjekkisk_nationalbibliotek" title="Tjekkisk nationalbibliotek">NKC</a>: <span class="uid"><a rel="nofollow" class="external text" href="http://aleph.nkp.cz/F/?func=find-c&local_base=aut&ccl_term=ica=ph116358&CON_LNG=ENG">ph116358</a></span></li> <li><a href="/wiki/Spaniens_nationalbibliotek" title="Spaniens nationalbibliotek">BNE</a>: <span class="uid"><a rel="nofollow" class="external text" href="http://catalogo.bne.es/uhtbin/authoritybrowse.cgi?action=display&authority_id=XX525938">XX525938</a></span></li></ul> </div></td></tr></tbody></table></div>    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