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terminivõistlus\u003C/a\u003E\u003C/b\u003E!\u003C/small\u003E\u003C/span\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/div\u003E\u003C/div\u003E\u003C/div\u003E";}}());</script></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Sait"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Sisukord" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" 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">Sisukord</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">vii külgpaanile</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">peida</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">Algus</div> </a> </li> <li id="toc-Liigitus" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Liigitus"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Liigitus</span> </div> </a> <ul id="toc-Liigitus-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Kasutamine" class="vector-toc-list-item vector-toc-level-1 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id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Lääts</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="Mine teises keeles artiklisse. Saadaval 97 keeles" > <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-97" 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">97 keelt</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/Lens" title="Lens – afrikaani" lang="af" hreflang="af" data-title="Lens" data-language-autonym="Afrikaans" data-language-local-name="afrikaani" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-am mw-list-item"><a href="https://am.wikipedia.org/wiki/%E1%88%9D%E1%88%B5%E1%88%AE" title="ምስሮ – amhara" lang="am" hreflang="am" data-title="ምስሮ" data-language-autonym="አማርኛ" data-language-local-name="amhara" class="interlanguage-link-target"><span>አማርኛ</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%B9%D8%AF%D8%B3%D8%A9_(%D8%A8%D8%B5%D8%B1%D9%8A%D8%A7%D8%AA)" title="عدسة (بصريات) – araabia" lang="ar" hreflang="ar" data-title="عدسة (بصريات)" data-language-autonym="العربية" data-language-local-name="araabia" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Lente" title="Lente – astuuria" lang="ast" hreflang="ast" data-title="Lente" data-language-autonym="Asturianu" data-language-local-name="astuuria" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Linza" title="Linza – aserbaidžaani" lang="az" hreflang="az" data-title="Linza" data-language-autonym="Azərbaycanca" data-language-local-name="aserbaidžaani" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Lensa" title="Lensa – indoneesia" lang="id" hreflang="id" data-title="Lensa" data-language-autonym="Bahasa Indonesia" data-language-local-name="indoneesia" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Kanta" title="Kanta – malai" lang="ms" hreflang="ms" data-title="Kanta" data-language-autonym="Bahasa Melayu" data-language-local-name="malai" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%B2%E0%A7%87%E0%A6%A8%E0%A7%8D%E0%A6%B8" title="লেন্স – bengali" lang="bn" hreflang="bn" data-title="লেন্স" data-language-autonym="বাংলা" data-language-local-name="bengali" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/Th%C3%A0u-ki%C3%A0%E2%81%BF" title="Thàu-kiàⁿ – lõunamini" lang="nan" hreflang="nan" data-title="Thàu-kiàⁿ" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="lõunamini" class="interlanguage-link-target"><span>閩南語 / Bân-lâm-gú</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%9B%D1%96%D0%BD%D0%B7%D0%B0" title="Лінза – valgevene" lang="be" hreflang="be" data-title="Лінза" data-language-autonym="Беларуская" data-language-local-name="valgevene" 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%9B%D1%96%D0%BD%D0%B7%D0%B0" title="Лінза – valgevene (taraškievitsa)" lang="be-tarask" hreflang="be-tarask" data-title="Лінза" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="valgevene (taraškievitsa)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bh mw-list-item"><a href="https://bh.wikipedia.org/wiki/%E0%A4%B2%E0%A5%87%E0%A4%82%E0%A4%B8" title="लेंस – bihaari" lang="bh" hreflang="bh" data-title="लेंस" data-language-autonym="भोजपुरी" data-language-local-name="bihaari" class="interlanguage-link-target"><span>भोजपुरी</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Le%C4%87a_(optika)" title="Leća (optika) – bosnia" lang="bs" hreflang="bs" data-title="Leća (optika)" data-language-autonym="Bosanski" data-language-local-name="bosnia" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%9B%D0%B5%D1%89%D0%B0_(%D0%BE%D0%BF%D1%82%D0%B8%D0%BA%D0%B0)" title="Леща (оптика) – bulgaaria" lang="bg" hreflang="bg" data-title="Леща (оптика)" data-language-autonym="Български" data-language-local-name="bulgaaria" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Lent" title="Lent – katalaani" lang="ca" hreflang="ca" data-title="Lent" data-language-autonym="Català" data-language-local-name="katalaani" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/%C4%8Co%C4%8Dka_(optika)" title="Čočka (optika) – tšehhi" lang="cs" hreflang="cs" data-title="Čočka (optika)" data-language-autonym="Čeština" data-language-local-name="tšehhi" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Optisk_linse" title="Optisk linse – taani" lang="da" hreflang="da" data-title="Optisk linse" data-language-autonym="Dansk" data-language-local-name="taani" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Linse_(Optik)" title="Linse (Optik) – saksa" lang="de" hreflang="de" data-title="Linse (Optik)" data-language-autonym="Deutsch" data-language-local-name="saksa" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-dsb mw-list-item"><a href="https://dsb.wikipedia.org/wiki/Linsa_(optika)" title="Linsa (optika) – alamsorbi" lang="dsb" hreflang="dsb" data-title="Linsa (optika)" data-language-autonym="Dolnoserbski" data-language-local-name="alamsorbi" class="interlanguage-link-target"><span>Dolnoserbski</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%A6%CE%B1%CE%BA%CF%8C%CF%82" title="Φακός – kreeka" lang="el" hreflang="el" data-title="Φακός" data-language-autonym="Ελληνικά" data-language-local-name="kreeka" 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/Lens" title="Lens – inglise" lang="en" hreflang="en" data-title="Lens" data-language-autonym="English" data-language-local-name="inglise" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Lente" title="Lente – hispaania" lang="es" hreflang="es" data-title="Lente" data-language-autonym="Español" data-language-local-name="hispaania" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Lenso_(optiko)" title="Lenso (optiko) – esperanto" lang="eo" hreflang="eo" data-title="Lenso (optiko)" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Leiar" title="Leiar – baski" lang="eu" hreflang="eu" data-title="Leiar" data-language-autonym="Euskara" data-language-local-name="baski" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%B9%D8%AF%D8%B3%DB%8C" title="عدسی – pärsia" lang="fa" hreflang="fa" data-title="عدسی" data-language-autonym="فارسی" data-language-local-name="pärsia" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Lentille_optique" title="Lentille optique – prantsuse" lang="fr" hreflang="fr" data-title="Lentille optique" data-language-autonym="Français" data-language-local-name="prantsuse" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-fy mw-list-item"><a href="https://fy.wikipedia.org/wiki/Lins_(optyk)" title="Lins (optyk) – läänefriisi" lang="fy" hreflang="fy" data-title="Lins (optyk)" data-language-autonym="Frysk" data-language-local-name="läänefriisi" 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/Lionsa_(optaic)" title="Lionsa (optaic) – iiri" lang="ga" hreflang="ga" data-title="Lionsa (optaic)" data-language-autonym="Gaeilge" data-language-local-name="iiri" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Lente_(%C3%B3ptica)" title="Lente (óptica) – galeegi" lang="gl" hreflang="gl" data-title="Lente (óptica)" data-language-autonym="Galego" data-language-local-name="galeegi" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-gan mw-list-item"><a href="https://gan.wikipedia.org/wiki/%E9%80%8F%E9%8F%A1" title="透鏡 – kani" lang="gan" hreflang="gan" data-title="透鏡" data-language-autonym="贛語" data-language-local-name="kani" class="interlanguage-link-target"><span>贛語</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EB%A0%8C%EC%A6%88" title="렌즈 – korea" lang="ko" hreflang="ko" data-title="렌즈" data-language-autonym="한국어" data-language-local-name="korea" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%88%D5%BD%D5%BA%D5%B6%D5%B5%D5%A1%D5%AF%D5%B6%D5%A5%D6%80" title="Ոսպնյակներ – armeenia" lang="hy" hreflang="hy" data-title="Ոսպնյակներ" data-language-autonym="Հայերեն" data-language-local-name="armeenia" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%B2%E0%A5%87%E0%A4%82%E0%A4%B8" title="लेंस – hindi" lang="hi" hreflang="hi" data-title="लेंस" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hsb mw-list-item"><a href="https://hsb.wikipedia.org/wiki/%C4%8C%C3%B3%C4%8Dka_(optika)" title="Čóčka (optika) – ülemsorbi" lang="hsb" hreflang="hsb" data-title="Čóčka (optika)" data-language-autonym="Hornjoserbsce" data-language-local-name="ülemsorbi" class="interlanguage-link-target"><span>Hornjoserbsce</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Le%C4%87a_(optika)" title="Leća (optika) – horvaadi" lang="hr" hreflang="hr" data-title="Leća (optika)" data-language-autonym="Hrvatski" data-language-local-name="horvaadi" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-io mw-list-item"><a href="https://io.wikipedia.org/wiki/Lenso" title="Lenso – ido" lang="io" hreflang="io" data-title="Lenso" 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/Linsa" title="Linsa – islandi" lang="is" hreflang="is" data-title="Linsa" data-language-autonym="Íslenska" data-language-local-name="islandi" 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/Lente" title="Lente – itaalia" lang="it" hreflang="it" data-title="Lente" data-language-autonym="Italiano" data-language-local-name="itaalia" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%A2%D7%93%D7%A9%D7%94" title="עדשה – heebrea" lang="he" hreflang="he" data-title="עדשה" data-language-autonym="עברית" data-language-local-name="heebrea" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-jv mw-list-item"><a href="https://jv.wikipedia.org/wiki/L%C3%A8nsa" title="Lènsa – jaava" lang="jv" hreflang="jv" data-title="Lènsa" data-language-autonym="Jawa" data-language-local-name="jaava" class="interlanguage-link-target"><span>Jawa</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%9B%D0%B8%D0%BD%D0%B7%D0%B0" title="Линза – kasahhi" lang="kk" hreflang="kk" data-title="Линза" data-language-autonym="Қазақша" data-language-local-name="kasahhi" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wikipedia.org/wiki/%D0%9B%D0%B8%D0%BD%D0%B7%D0%B0" title="Линза – kirgiisi" lang="ky" hreflang="ky" data-title="Линза" data-language-autonym="Кыргызча" data-language-local-name="kirgiisi" class="interlanguage-link-target"><span>Кыргызча</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Lenzi" title="Lenzi – suahiili" lang="sw" hreflang="sw" data-title="Lenzi" data-language-autonym="Kiswahili" data-language-local-name="suahiili" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/Lantiy" title="Lantiy – haiti" lang="ht" hreflang="ht" data-title="Lantiy" data-language-autonym="Kreyòl ayisyen" data-language-local-name="haiti" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-gcr mw-list-item"><a href="https://gcr.wikipedia.org/wiki/Lanti_optik" title="Lanti optik – Guajaana kreoolkeel" lang="gcr" hreflang="gcr" data-title="Lanti optik" data-language-autonym="Kriyòl gwiyannen" data-language-local-name="Guajaana kreoolkeel" class="interlanguage-link-target"><span>Kriyòl gwiyannen</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/L%C4%93ca" title="Lēca – läti" lang="lv" hreflang="lv" data-title="Lēca" data-language-autonym="Latviešu" data-language-local-name="läti" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/L%C4%99%C5%A1is_(optika)" title="Lęšis (optika) – leedu" lang="lt" hreflang="lt" data-title="Lęšis (optika)" data-language-autonym="Lietuvių" data-language-local-name="leedu" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lmo mw-list-item"><a href="https://lmo.wikipedia.org/wiki/Lenta_(ottica)" title="Lenta (ottica) – lombardi" lang="lmo" hreflang="lmo" data-title="Lenta (ottica)" data-language-autonym="Lombard" data-language-local-name="lombardi" class="interlanguage-link-target"><span>Lombard</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Optikai_lencse" title="Optikai lencse – ungari" lang="hu" hreflang="hu" data-title="Optikai lencse" data-language-autonym="Magyar" data-language-local-name="ungari" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%9B%D0%B5%D1%9C%D0%B0_(%D0%BE%D0%BF%D1%82%D0%B8%D0%BA%D0%B0)" title="Леќа (оптика) – makedoonia" lang="mk" hreflang="mk" data-title="Леќа (оптика)" data-language-autonym="Македонски" data-language-local-name="makedoonia" 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%B2%E0%B5%86%E0%B5%BB%E0%B4%B8%E0%B5%8D" title="ലെൻസ് – malajalami" lang="ml" hreflang="ml" data-title="ലെൻസ്" data-language-autonym="മലയാളം" data-language-local-name="malajalami" 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%9B%D0%B8%D0%BD%D0%B7" title="Линз – mongoli" lang="mn" hreflang="mn" data-title="Линз" data-language-autonym="Монгол" data-language-local-name="mongoli" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Lens_(optica)" title="Lens (optica) – hollandi" lang="nl" hreflang="nl" data-title="Lens (optica)" data-language-autonym="Nederlands" data-language-local-name="hollandi" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ne mw-list-item"><a href="https://ne.wikipedia.org/wiki/%E0%A4%95%E0%A4%A8%E0%A5%8D%E0%A4%AD%E0%A5%87%E0%A4%95%E0%A5%8D%E0%A4%B8_%E0%A4%B2%E0%A5%87%E0%A4%A8%E0%A5%8D%E0%A4%B8" title="कन्भेक्स लेन्स – nepali" lang="ne" hreflang="ne" data-title="कन्भेक्स लेन्स" data-language-autonym="नेपाली" data-language-local-name="nepali" class="interlanguage-link-target"><span>नेपाली</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%83%AC%E3%83%B3%E3%82%BA" title="レンズ – jaapani" lang="ja" hreflang="ja" data-title="レンズ" data-language-autonym="日本語" data-language-local-name="jaapani" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-frr mw-list-item"><a href="https://frr.wikipedia.org/wiki/Lins_(Optik)" title="Lins (Optik) – põhjafriisi" lang="frr" hreflang="frr" data-title="Lins (Optik)" data-language-autonym="Nordfriisk" data-language-local-name="põhjafriisi" class="interlanguage-link-target"><span>Nordfriisk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Optisk_linse" title="Optisk linse – norra bokmål" lang="nb" hreflang="nb" data-title="Optisk linse" data-language-autonym="Norsk bokmål" data-language-local-name="norra bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Optisk_linse" title="Optisk linse – uusnorra" lang="nn" hreflang="nn" data-title="Optisk linse" data-language-autonym="Norsk nynorsk" data-language-local-name="uusnorra" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-om mw-list-item"><a href="https://om.wikipedia.org/wiki/Doo%27innee" title="Doo'innee – oromo" lang="om" hreflang="om" data-title="Doo'innee" data-language-autonym="Oromoo" data-language-local-name="oromo" class="interlanguage-link-target"><span>Oromoo</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Linza" title="Linza – usbeki" lang="uz" hreflang="uz" data-title="Linza" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="usbeki" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%B2%E0%A9%88%E0%A9%B1%E0%A8%A8%E0%A8%9C%E0%A8%BC" title="ਲੈੱਨਜ਼ – pandžabi" lang="pa" hreflang="pa" data-title="ਲੈੱਨਜ਼" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="pandžabi" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-jam mw-list-item"><a href="https://jam.wikipedia.org/wiki/Lenz" title="Lenz – Jamaica kreoolkeel" lang="jam" hreflang="jam" data-title="Lenz" data-language-autonym="Patois" data-language-local-name="Jamaica kreoolkeel" class="interlanguage-link-target"><span>Patois</span></a></li><li class="interlanguage-link interwiki-pms mw-list-item"><a href="https://pms.wikipedia.org/wiki/Lent" title="Lent – piemonte" lang="pms" hreflang="pms" data-title="Lent" data-language-autonym="Piemontèis" data-language-local-name="piemonte" class="interlanguage-link-target"><span>Piemontèis</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Soczewka" title="Soczewka – poola" lang="pl" hreflang="pl" data-title="Soczewka" data-language-autonym="Polski" data-language-local-name="poola" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Lente" title="Lente – portugali" lang="pt" hreflang="pt" data-title="Lente" data-language-autonym="Português" data-language-local-name="portugali" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Lentil%C4%83_(optic%C4%83)" title="Lentilă (optică) – rumeenia" lang="ro" hreflang="ro" data-title="Lentilă (optică)" data-language-autonym="Română" data-language-local-name="rumeenia" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-qu mw-list-item"><a href="https://qu.wikipedia.org/wiki/Linti" title="Linti – ketšua" lang="qu" hreflang="qu" data-title="Linti" data-language-autonym="Runa Simi" data-language-local-name="ketšua" class="interlanguage-link-target"><span>Runa Simi</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9B%D0%B8%D0%BD%D0%B7%D0%B0" title="Линза – vene" lang="ru" hreflang="ru" data-title="Линза" data-language-autonym="Русский" data-language-local-name="vene" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Thjerra_optike" title="Thjerra optike – albaania" lang="sq" hreflang="sq" data-title="Thjerra optike" data-language-autonym="Shqip" data-language-local-name="albaania" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-scn mw-list-item"><a href="https://scn.wikipedia.org/wiki/Lenti" title="Lenti – sitsiilia" lang="scn" hreflang="scn" data-title="Lenti" data-language-autonym="Sicilianu" data-language-local-name="sitsiilia" class="interlanguage-link-target"><span>Sicilianu</span></a></li><li class="interlanguage-link interwiki-si mw-list-item"><a href="https://si.wikipedia.org/wiki/%E0%B6%9A%E0%B7%8F%E0%B6%A0" title="කාච – singali" lang="si" hreflang="si" data-title="කාච" data-language-autonym="සිංහල" data-language-local-name="singali" 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/Lens_(optics)" title="Lens (optics) – lihtsustatud inglise" lang="en-simple" hreflang="en-simple" data-title="Lens (optics)" data-language-autonym="Simple English" data-language-local-name="lihtsustatud inglise" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sd mw-list-item"><a href="https://sd.wikipedia.org/wiki/%D8%A7%D9%BE%D9%BD%D9%8A%D9%84_%D8%A8%D9%84%D9%88%D8%B1" title="اپٽيل بلور – sindhi" lang="sd" hreflang="sd" data-title="اپٽيل بلور" data-language-autonym="سنڌي" data-language-local-name="sindhi" class="interlanguage-link-target"><span>سنڌي</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/%C5%A0o%C5%A1ovka_(optika)" title="Šošovka (optika) – slovaki" lang="sk" hreflang="sk" data-title="Šošovka (optika)" data-language-autonym="Slovenčina" data-language-local-name="slovaki" 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/Le%C4%8Da_(optika)" title="Leča (optika) – sloveeni" lang="sl" hreflang="sl" data-title="Leča (optika)" data-language-autonym="Slovenščina" data-language-local-name="sloveeni" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%D9%84%DB%8E%D9%86%D8%B2" title="لێنز – sorani" lang="ckb" hreflang="ckb" data-title="لێنز" data-language-autonym="کوردی" data-language-local-name="sorani" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%A1%D0%BE%D1%87%D0%B8%D0%B2%D0%BE_(%D0%BE%D0%BF%D1%82%D0%B8%D0%BA%D0%B0)" title="Сочиво (оптика) – serbia" lang="sr" hreflang="sr" data-title="Сочиво (оптика)" data-language-autonym="Српски / srpski" data-language-local-name="serbia" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Le%C4%87a" title="Leća – serbia-horvaadi" lang="sh" hreflang="sh" data-title="Leća" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbia-horvaadi" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-su mw-list-item"><a href="https://su.wikipedia.org/wiki/L%C3%A9nsa" title="Lénsa – sunda" lang="su" hreflang="su" data-title="Lénsa" data-language-autonym="Sunda" data-language-local-name="sunda" class="interlanguage-link-target"><span>Sunda</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Linssi_(optiikka)" title="Linssi (optiikka) – soome" lang="fi" hreflang="fi" data-title="Linssi (optiikka)" data-language-autonym="Suomi" data-language-local-name="soome" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Lins" title="Lins – rootsi" lang="sv" hreflang="sv" data-title="Lins" data-language-autonym="Svenska" data-language-local-name="rootsi" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tl mw-list-item"><a href="https://tl.wikipedia.org/wiki/Lente_(optika)" title="Lente (optika) – tagalogi" lang="tl" hreflang="tl" data-title="Lente (optika)" data-language-autonym="Tagalog" data-language-local-name="tagalogi" class="interlanguage-link-target"><span>Tagalog</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%B5%E0%AE%BF%E0%AE%B2%E0%AF%8D%E0%AE%B2%E0%AF%88_(%E0%AE%92%E0%AE%B3%E0%AE%BF%E0%AE%AF%E0%AE%BF%E0%AE%AF%E0%AE%B2%E0%AF%8D)" title="வில்லை (ஒளியியல்) – tamili" lang="ta" hreflang="ta" data-title="வில்லை (ஒளியியல்)" data-language-autonym="தமிழ்" data-language-local-name="tamili" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/%D0%9B%D0%B8%D0%BD%D0%B7%D0%B0" title="Линза – tatari" lang="tt" hreflang="tt" data-title="Линза" data-language-autonym="Татарча / tatarça" data-language-local-name="tatari" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-te mw-list-item"><a href="https://te.wikipedia.org/wiki/%E0%B0%95%E0%B0%9F%E0%B0%95%E0%B0%AE%E0%B1%81_(%E0%B0%B5%E0%B0%B8%E0%B1%8D%E0%B0%A4%E0%B1%81%E0%B0%B5%E0%B1%81)" title="కటకము (వస్తువు) – telugu" lang="te" hreflang="te" data-title="కటకము (వస్తువు)" 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%80%E0%B8%A5%E0%B8%99%E0%B8%AA%E0%B9%8C_(%E0%B8%97%E0%B8%B1%E0%B8%A8%E0%B8%99%E0%B8%A8%E0%B8%B2%E0%B8%AA%E0%B8%95%E0%B8%A3%E0%B9%8C)" title="เลนส์ (ทัศนศาสตร์) – tai" lang="th" hreflang="th" data-title="เลนส์ (ทัศนศาสตร์)" data-language-autonym="ไทย" data-language-local-name="tai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Th%E1%BA%A5u_k%C3%ADnh" title="Thấu kính – vietnami" lang="vi" hreflang="vi" data-title="Thấu kính" data-language-autonym="Tiếng Việt" data-language-local-name="vietnami" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-tg mw-list-item"><a href="https://tg.wikipedia.org/wiki/%D0%9B%D0%B8%D0%BD%D0%B7%D0%B0" title="Линза – tadžiki" lang="tg" hreflang="tg" data-title="Линза" data-language-autonym="Тоҷикӣ" data-language-local-name="tadžiki" class="interlanguage-link-target"><span>Тоҷикӣ</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Mercek" title="Mercek – türgi" lang="tr" hreflang="tr" data-title="Mercek" data-language-autonym="Türkçe" data-language-local-name="türgi" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9B%D1%96%D0%BD%D0%B7%D0%B0" title="Лінза – ukraina" lang="uk" hreflang="uk" data-title="Лінза" data-language-autonym="Українська" data-language-local-name="ukraina" 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%B9%D8%AF%D8%B3%DB%81_(%D8%A8%D8%B5%D8%B1%DB%8C%D8%A7%D8%AA)" title="عدسہ (بصریات) – urdu" lang="ur" hreflang="ur" data-title="عدسہ (بصریات)" data-language-autonym="اردو" data-language-local-name="urdu" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-war mw-list-item"><a href="https://war.wikipedia.org/wiki/Lente" title="Lente – varai" lang="war" hreflang="war" data-title="Lente" data-language-autonym="Winaray" data-language-local-name="varai" 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/%E9%80%8F%E9%95%9C" title="透镜 – uu" lang="wuu" hreflang="wuu" data-title="透镜" data-language-autonym="吴语" data-language-local-name="uu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-yi mw-list-item"><a href="https://yi.wikipedia.org/wiki/%D7%9C%D7%99%D7%A0%D7%93%D7%96" title="לינדז – jidiši" lang="yi" hreflang="yi" data-title="לינדז" data-language-autonym="ייִדיש" data-language-local-name="jidiši" class="interlanguage-link-target"><span>ייִדיש</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E9%80%8F%E9%8F%A1" title="透鏡 – kantoni" lang="yue" hreflang="yue" data-title="透鏡" data-language-autonym="粵語" data-language-local-name="kantoni" class="interlanguage-link-target"><span>粵語</span></a></li><li class="interlanguage-link interwiki-diq mw-list-item"><a href="https://diq.wikipedia.org/wiki/Lens_(optik)" title="Lens (optik) – dõmli" lang="diq" hreflang="diq" data-title="Lens (optik)" data-language-autonym="Zazaki" data-language-local-name="dõmli" 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title="Lisateave selle lehekülje kohta"><span>Lehekülje teave</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Eri:Sellele_lehek%C3%BCljele_viitamine&page=L%C3%A4%C3%A4ts&id=5808861&wpFormIdentifier=titleform" title="Teave sellele leheküljele viitamise kohta"><span>Viita leheküljele</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Eri:UrlShortener&url=https%3A%2F%2Fet.wikipedia.org%2Fwiki%2FL%25C3%25A4%25C3%25A4ts"><span>Hangi lühendatud URL</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Eri:QrCode&url=https%3A%2F%2Fet.wikipedia.org%2Fwiki%2FL%25C3%25A4%25C3%25A4ts"><span>Laadi alla QR-kood</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"> Teistes projektides </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/Lenses" hreflang="en"><span>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/Q768575" title="Link andmehoidla seonduva üksuse juurde [g]" accesskey="g"><span>Andmeüksus</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="Lehekülje tööriistad"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Ilme"> <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">Ilme</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">vii külgpaanile</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">peida</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">Allikas: Vikipeedia</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="et" dir="ltr"><table> <tbody><tr> <td><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5f/Disambig_gray.svg/25px-Disambig_gray.svg.png" decoding="async" width="25" height="19" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5f/Disambig_gray.svg/38px-Disambig_gray.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5f/Disambig_gray.svg/50px-Disambig_gray.svg.png 2x" data-file-width="220" data-file-height="168" /></span></span> </td> <td> <i>See artikkel räägib optika mõistest; kaunvilja kohta vaata artiklit <a href="/wiki/L%C3%A4%C3%A4ts_(kaunvili)" title="Lääts (kaunvili)">Lääts (kaunvili)</a>; kultuurtaime kohta vaata artiklit <a href="/w/index.php?title=Harilik_l%C3%A4%C3%A4ts&action=edit&redlink=1" class="new" title="Harilik lääts (pole veel kirjutatud)">Harilik lääts</a>; taimeperekonna kohta vaata artiklit <a href="/w/index.php?title=L%C3%A4%C3%A4ts_(perekond)&action=edit&redlink=1" class="new" title="Lääts (perekond) (pole veel kirjutatud)">Lääts</a>; toiduaine kohta vaata artiklit <a href="/w/index.php?title=L%C3%A4%C3%A4tsed_(toiduaine)&action=edit&redlink=1" class="new" title="Läätsed (toiduaine) (pole veel kirjutatud)">Läätsed (toiduaine)</a>; silma osa kohta vaata artiklit <a href="/wiki/Silmal%C3%A4%C3%A4ts" title="Silmalääts">Silmalääts</a>; perekonnanime kohta vaata artiklit <a href="/wiki/L%C3%A4%C3%A4ts_(perekonnanimi)" title="Lääts (perekonnanimi)">Lääts (perekonnanimi)</a></i> </td></tr></tbody></table> <hr /> <figure typeof="mw:File/Thumb"><a href="/wiki/Fail:Lenses_en.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a7/Lenses_en.svg/400px-Lenses_en.svg.png" decoding="async" width="400" height="187" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a7/Lenses_en.svg/600px-Lenses_en.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a7/Lenses_en.svg/800px-Lenses_en.svg.png 2x" data-file-width="567" data-file-height="265" /></a><figcaption>Läätsede tüüpe: kaksikkumer, tasakumer, positiivne <a href="/wiki/Menisk" class="mw-disambig" title="Menisk">menisk</a>, negatiivne menisk, tasanõgus, kaksiknõgus</figcaption></figure> <p><b>Lääts</b> on läbipaistvast ainest keha, mida piiravad kaks kõverat, harilikult sfäärilist pinda. Pindade ühist sümmeetriatelge nimetatakse optiliseks teljeks. </p><p>Läätse iseloomustavad suurused on <a href="/wiki/Fookuskaugus" title="Fookuskaugus">fookuskaugus</a> <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle f\,}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>f</mi> <mspace width="thinmathspace" /> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle f\,}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/ba5397b34cab7d96daac496a937b0c0fa076dff7" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:1.666ex; height:2.509ex;" alt="{\displaystyle f\,}"></span> ja <a href="/wiki/Optiline_tugevus" title="Optiline tugevus">optiline tugevus</a> <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle 1/f}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mn>1</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mi>f</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle 1/f}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/e9cd0e60c02ddf533da2abed825389fe5a94b7d0" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:3.603ex; height:2.843ex;" alt="{\displaystyle 1/f}"></span> , mis iseloomustab valguse koondamise või hajutamise võimet. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Liigitus">Liigitus</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=L%C3%A4%C3%A4ts&veaction=edit&section=1" title="Muuda alaosa "Liigitus"" class="mw-editsection-visualeditor"><span>muuda</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=L%C3%A4%C3%A4ts&action=edit&section=1" title="Muuda alaosa "Liigitus" lähteteksti"><span>muuda lähteteksti</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Läätsi liigitatakse kumer- ja nõgusläätsedeks. <a href="/wiki/Kumerl%C3%A4%C3%A4ts" class="mw-redirect" title="Kumerlääts">Kumerlääts</a> on keskelt paksem, <a href="/wiki/N%C3%B5gusl%C3%A4%C3%A4ts" class="mw-redirect" title="Nõguslääts">nõguslääts</a> on aga keskelt õhem kui servast. Kumerlääts koondab valgust, nõguslääts hajutab valgust. Läätsena toimib kumerate pindadega läbipaistvast ainest keha siis, kui keha materjali <a href="/wiki/Murdumisn%C3%A4itaja" title="Murdumisnäitaja">murdumisnäitaja</a> erineb ümbritseva keskkonna murdumisnäitajast. Kui läätse materjali <a href="/wiki/Murdumisn%C3%A4itaja" title="Murdumisnäitaja">murdumisnäitaja</a> on ümbritseva keskkonna murdumisnäitajast suurem (nagu klaasil õhu suhtes), siis kumerlääts koondab ja nõguslääts hajutab valgust. </p><p>Koondav lääts tekitab tõelise ümberpööratud suurendatud või vähendatud kujutise või näilise päripidise suurendatud kujutise. Koondavat läätse saab kasutada <a href="/wiki/Luup" title="Luup">luubina</a>. Hajutav lääts annab näilise päripidise vähendatud kujutise. </p> <table> <tbody><tr> <td><b>Kumerlääts</b></td> <td><span typeof="mw:File"><a href="/wiki/Fail:Lens1.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Lens1.svg/350px-Lens1.svg.png" decoding="async" width="350" height="231" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Lens1.svg/525px-Lens1.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Lens1.svg/700px-Lens1.svg.png 2x" data-file-width="522" data-file-height="345" /></a></span></td> <td><span typeof="mw:File"><a href="/wiki/Fail:Large_convex_lens.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/82/Large_convex_lens.jpg/350px-Large_convex_lens.jpg" decoding="async" width="350" height="227" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/82/Large_convex_lens.jpg/525px-Large_convex_lens.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/82/Large_convex_lens.jpg/700px-Large_convex_lens.jpg 2x" data-file-width="798" data-file-height="518" /></a></span> </td></tr> <tr> <td><b>Nõguslääts</b></td> <td><span typeof="mw:File"><a href="/wiki/Fail:Lens1b.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/ab/Lens1b.svg/350px-Lens1b.svg.png" decoding="async" width="350" height="231" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/ab/Lens1b.svg/525px-Lens1b.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/ab/Lens1b.svg/700px-Lens1b.svg.png 2x" data-file-width="522" data-file-height="345" /></a></span></td> <td><span typeof="mw:File"><a href="/wiki/Fail:Concave_lens.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/32/Concave_lens.jpg/350px-Concave_lens.jpg" decoding="async" width="350" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/32/Concave_lens.jpg/525px-Concave_lens.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/32/Concave_lens.jpg/700px-Concave_lens.jpg 2x" data-file-width="800" data-file-height="378" /></a></span> </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="Kasutamine">Kasutamine</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=L%C3%A4%C3%A4ts&veaction=edit&section=2" title="Muuda alaosa "Kasutamine"" class="mw-editsection-visualeditor"><span>muuda</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=L%C3%A4%C3%A4ts&action=edit&section=2" title="Muuda alaosa "Kasutamine" lähteteksti"><span>muuda lähteteksti</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Läätsi kasutatakse kõikvõimalikes optilistes seadmetes, nagu <a href="/wiki/Pikksilm" title="Pikksilm">pikksilmad</a>, <a href="/wiki/Teleskoop" title="Teleskoop">teleskoobid</a>, <a href="/wiki/Mikroskoop" title="Mikroskoop">mikroskoobid</a>, <a href="/wiki/Kaamera" title="Kaamera">kaamerad</a>. Läätsi kasutatakse ka nägemishäirete korrektsiooniks, näiteks <a href="/wiki/L%C3%BChin%C3%A4gevus" title="Lühinägevus">lühinägevuse</a>, <a href="/wiki/Kaugelen%C3%A4gevus" title="Kaugelenägevus">kaugelenägevuse</a>, <a href="/wiki/Presb%C3%BCoopia" class="mw-redirect" title="Presbüoopia">presbüoopia</a> (vananemisest tingitud nägemise langus) ja <a href="/wiki/Astigmatism" title="Astigmatism">astigmatismi</a> korrektsiooniks. Enamik läätsedest on rangelt telgsümmeetrilised. Prillide läätsed on ainult ligikaudselt sümmeetrilised, sest on vormitud prilliraamidega sobivaks. Nende kumerus ei pruugi olla telgsümmeetriline, et korrigeerida astigmatismi. </p><p>Selliseid koondavaid läätsi, mis pole isegi ligikaudselt optiliselt korrektsed, on kasutatud sajandeid tule süütamiseks. </p> <div class="mw-heading mw-heading2"><h2 id="Arvutus">Arvutus</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=L%C3%A4%C3%A4ts&veaction=edit&section=3" title="Muuda alaosa "Arvutus"" class="mw-editsection-visualeditor"><span>muuda</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=L%C3%A4%C3%A4ts&action=edit&section=3" title="Muuda alaosa "Arvutus" lähteteksti"><span>muuda lähteteksti</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Sfääriliste pindadega läätse fookuskaugust õhus saab arvutada järgmise valemiga: </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\frac {1}{f}}=(n-1)\left[{\frac {1}{R_{1}}}-{\frac {1}{R_{2}}}+{\frac {(n-1)d}{nR_{1}R_{2}}}\right],}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mi>f</mi> </mfrac> </mrow> <mo>=</mo> <mo stretchy="false">(</mo> <mi>n</mi> <mo>−</mo> <mn>1</mn> <mo stretchy="false">)</mo> <mrow> <mo>[</mo> <mrow> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <msub> <mi>R</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> </mrow> </msub> </mfrac> </mrow> <mo>−</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <msub> <mi>R</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> </mfrac> </mrow> <mo>+</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mo stretchy="false">(</mo> <mi>n</mi> <mo>−</mo> <mn>1</mn> <mo stretchy="false">)</mo> <mi>d</mi> </mrow> <mrow> <mi>n</mi> <msub> <mi>R</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> </mrow> </msub> <msub> <mi>R</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> </mrow> </mfrac> </mrow> </mrow> <mo>]</mo> </mrow> <mo>,</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\frac {1}{f}}=(n-1)\left[{\frac {1}{R_{1}}}-{\frac {1}{R_{2}}}+{\frac {(n-1)d}{nR_{1}R_{2}}}\right],}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/26fb54977c7f965da063dcaded08258c3377f1d9" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.505ex; width:38.544ex; height:6.343ex;" alt="{\displaystyle {\frac {1}{f}}=(n-1)\left[{\frac {1}{R_{1}}}-{\frac {1}{R_{2}}}+{\frac {(n-1)d}{nR_{1}R_{2}}}\right],}"></span></dd></dl> <p>kus </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle f\,}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>f</mi> <mspace width="thinmathspace" /> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle f\,}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/ba5397b34cab7d96daac496a937b0c0fa076dff7" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:1.666ex; height:2.509ex;" alt="{\displaystyle f\,}"></span> on läätse fookuskaugus,</dd> <dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle n\,}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>n</mi> <mspace width="thinmathspace" /> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle n\,}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/205e33e6845813cc72ca346b896a7945f90ca373" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.782ex; height:1.676ex;" alt="{\displaystyle n\,}"></span> on läätse materjali absoluutne <a href="/wiki/Murdumisn%C3%A4itaja" title="Murdumisnäitaja">murdumisnäitaja</a>,</dd> <dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle R_{1}\,}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>R</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> </mrow> </msub> <mspace width="thinmathspace" /> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle R_{1}\,}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/5106fcf130c86f5f4a379c1673a0c9cad403ae6f" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:3.205ex; height:2.509ex;" alt="{\displaystyle R_{1}\,}"></span> on valgusallikale lähima läätsepinna <a href="/wiki/K%C3%B5verusraadius" title="Kõverusraadius">kõverusraadius</a>,</dd> <dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle R_{2}\,}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>R</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> <mspace width="thinmathspace" /> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle R_{2}\,}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/dfb85533e4d2a14e9d6db2a3af30e69d19c82e44" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:3.205ex; height:2.509ex;" alt="{\displaystyle R_{2}\,}"></span> on valgusallikast kaugeima läätsepinna kõverusraadius, ja</dd> <dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle d\,}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>d</mi> <mspace width="thinmathspace" /> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle d\,}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/0f203b686a923982358b9274fb508753ac31b996" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.603ex; height:2.176ex;" alt="{\displaystyle d\,}"></span> on läätse paksus.</dd></dl> <p>Õhukese läätse puhul kehtib lihtne seos </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\frac {1}{S_{1}}}+{\frac {1}{S_{2}}}={\frac {1}{f}},}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <msub> <mi>S</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> </mrow> </msub> </mfrac> </mrow> <mo>+</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <msub> <mi>S</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> </mfrac> </mrow> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mi>f</mi> </mfrac> </mrow> <mo>,</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\frac {1}{S_{1}}}+{\frac {1}{S_{2}}}={\frac {1}{f}},}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/9cf466a3b4662f8e99a3168b9c58f46c4034b22a" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.338ex; width:15.331ex; height:5.676ex;" alt="{\displaystyle {\frac {1}{S_{1}}}+{\frac {1}{S_{2}}}={\frac {1}{f}},}"></span></dd></dl> <p>kus <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle S_{1}\,}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>S</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> </mrow> </msub> <mspace width="thinmathspace" /> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle S_{1}\,}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/4a9e1d5c6c917a3a784a5fbbf6d74430fa4def6f" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.866ex; height:2.509ex;" alt="{\displaystyle S_{1}\,}"></span> on eseme kaugus ja <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle S_{2}\,}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>S</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> <mspace width="thinmathspace" /> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle S_{2}\,}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/75d9c88cb5a6078cf8930bc99350dda9575cc389" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.866ex; height:2.509ex;" alt="{\displaystyle S_{2}\,}"></span> on kujutise kaugus läätsest ning <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle f\,}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>f</mi> <mspace width="thinmathspace" /> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle f\,}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/ba5397b34cab7d96daac496a937b0c0fa076dff7" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:1.666ex; height:2.509ex;" alt="{\displaystyle f\,}"></span> läätse fookuskaugus. </p><p>Lõpmata kaugel oleva objekti kujutis asub kaugusel <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle f}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>f</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle f}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/132e57acb643253e7810ee9702d9581f159a1c61" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:1.279ex; height:2.509ex;" alt="{\displaystyle f}"></span>. Kui objekt asub läätsest kaugusel <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle f}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>f</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle f}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/132e57acb643253e7810ee9702d9581f159a1c61" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:1.279ex; height:2.509ex;" alt="{\displaystyle f}"></span>, siis selle kujutis asub lõpmata kaugel. Tasandit, mis on risti läätse <a href="/wiki/Optiline_telg" title="Optiline telg">optilise teljega</a> ja asub kaugusel <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle f\,}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>f</mi> <mspace width="thinmathspace" /> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle f\,}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/ba5397b34cab7d96daac496a937b0c0fa076dff7" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:1.666ex; height:2.509ex;" alt="{\displaystyle f\,}"></span>, nimetatakse läätse fokaaltasandiks. </p> <div class="mw-heading mw-heading2"><h2 id="Liitläätsed"><span id="Liitl.C3.A4.C3.A4tsed"></span>Liitläätsed</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=L%C3%A4%C3%A4ts&veaction=edit&section=4" title="Muuda alaosa "Liitläätsed"" class="mw-editsection-visualeditor"><span>muuda</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=L%C3%A4%C3%A4ts&action=edit&section=4" title="Muuda alaosa "Liitläätsed" lähteteksti"><span>muuda lähteteksti</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Liitläätsed on ühel teljel asuvad läätsed. Kui läätsed fookuskaugustega <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle f_{1}\,}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>f</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> </mrow> </msub> <mspace width="thinmathspace" /> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle f_{1}\,}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/b9e608b90c5c6df416013c46241d881ceb89897e" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.581ex; height:2.509ex;" alt="{\displaystyle f_{1}\,}"></span> ja <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle f_{2}\,}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>f</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> <mspace width="thinmathspace" /> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle f_{2}\,}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/af2d026b25a59a6c49f867b66f50f56fad946cca" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.581ex; height:2.509ex;" alt="{\displaystyle f_{2}\,}"></span> on kontaktis, siis kehtib valem </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\frac {1}{f}}={\frac {1}{f_{1}}}+{\frac {1}{f_{2}}}.}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mi>f</mi> </mfrac> </mrow> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <msub> <mi>f</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> </mrow> </msub> </mfrac> </mrow> <mo>+</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <msub> <mi>f</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> </mfrac> </mrow> <mo>.</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\frac {1}{f}}={\frac {1}{f_{1}}}+{\frac {1}{f_{2}}}.}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/10dbe62b924dc2e27e6fc6994d1303a6e40cdedb" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.338ex; width:14.76ex; height:5.676ex;" alt="{\displaystyle {\frac {1}{f}}={\frac {1}{f_{1}}}+{\frac {1}{f_{2}}}.}"></span></dd></dl> <p>Valemist selgub, et mida rohkem läätsesid optilisel teljel, seda suurem on nende summaarne <a href="/wiki/Optiline_tugevus" title="Optiline tugevus">optiline tugevus</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Ajaloost">Ajaloost</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=L%C3%A4%C3%A4ts&veaction=edit&section=5" title="Muuda alaosa "Ajaloost"" class="mw-editsection-visualeditor"><span>muuda</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=L%C3%A4%C3%A4ts&action=edit&section=5" title="Muuda alaosa "Ajaloost" lähteteksti"><span>muuda lähteteksti</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Vanim tehislik lääts on pärit aastast 640 eKr. – kvartsist lääts, mis leiti väljakaevamistel kunagisest <a href="/wiki/Ass%C3%BC%C3%BCria" title="Assüüria">Assüüria</a> linnast <a href="/wiki/Niinive" class="mw-redirect" title="Niinive">Niinivest</a>, mis asub tänapäeva <a href="/wiki/Iraak" title="Iraak">Iraagis</a> <a href="/wiki/Mosul" title="Mosul">Mosuli</a> linna alal. Esimesed kirjapanekud läätsedest on pärit Antiik-Kreekast – <a href="/wiki/Aristophanes" title="Aristophanes">Aristophanese</a> näidendist "Pilved" (424 eKr.), kus mainitakse läätse, mille abil süüdati lõket. <a href="/wiki/Plinius_Vanem" title="Plinius Vanem">Plinius Vanema</a> (23–79) kirjutised näitavad samuti, et põletusklaase tunti Rooma impeeriumis. Ta mainib tõenäoliselt esimest korrektiivläätse kasutust: <a href="/wiki/Nero" title="Nero">Nero</a> olevat vaadanud gladiaatorite mänge, kasutades smaragdi (arvatavasti nõgusat, et korrigeerida lühinägelikkust, kuigi viide on ebamäärane). Nii Plinius kui ka <a href="/wiki/Seneca_noorem" class="mw-redirect" title="Seneca noorem">Seneca noorem</a> (3 eKr – 65) kirjeldasid veega täidetud klaaskera suurendavat omadust. </p><p>Araabia matemaatik <a href="/w/index.php?title=Ibn_Sahl&action=edit&redlink=1" class="new" title="Ibn Sahl (pole veel kirjutatud)">Ibn Sahl</a> (u 940 – 1000) kasutas nüüdseks teada <a href="/w/index.php?title=Snelli_valem&action=edit&redlink=1" class="new" title="Snelli valem (pole veel kirjutatud)">Snelli valemit</a>, et arvutada läätse kuju. <a href="/w/index.php?title=Ibn_al-Haitham&action=edit&redlink=1" class="new" title="Ibn al-Haitham (pole veel kirjutatud)">Ibn al-Haitham</a> (965–1038) kirjutas esimese suure uurimuse, "Kitāb al-Manāẓir" ("Raamat optikast"), mis kirjeldab, kuidas inimese silmalääts projitseerib kujutise võrkkestale. </p><p>Väljakaevamistel viikingite sadamalinnas <a href="/w/index.php?title=Fr%C3%B6jel&action=edit&redlink=1" class="new" title="Fröjel (pole veel kirjutatud)">Fröjelis</a> (<a href="/wiki/Gotland" class="mw-redirect" title="Gotland">Gotlandil</a> <a href="/wiki/Rootsi" title="Rootsi">Rootsis</a>) 1999. aastal tulid välja kvartsist <a href="/w/index.php?title=Visby_l%C3%A4%C3%A4tsed&action=edit&redlink=1" class="new" title="Visby läätsed (pole veel kirjutatud)">Visby läätsed</a>, mis on pärit 11.–12. sajandist ja mille omadused on lähedased 1950. aastate asfääriliste läätsedega. Viikingite läätsed koondavad päikesevalgust piisavalt, et süüdata tuld. </p><p>Enne lugemiskivide kasutuselevõttu 11. sajandil ja prillide leiutamist umbes 1280 Itaalias polnud läätsede kasutus laialt levinud. Arvatakse, et <a href="/wiki/Nicolaus_Cusanus" title="Nicolaus Cusanus">Nicolaus Cusanus</a> oli esimene, kes avastas <a href="/wiki/1451" title="1451">1451</a>. aastal, et nõgusläätsega saab korrigeerida lühinägelikkust. </p><p><b>Abbe siinuse tingimus</b> on <a href="/wiki/Ernst_Abbe" title="Ernst Abbe">Ernst Abbe</a> järgi (1860. aasta paiku) nime saanud optilise süsteemi tingimus, mille korral tekivad teravad kujutised nii optilisel teljel olevatest objektidest kui ka optilisest teljest eemal olevatest objektidest. See muutis põhjalikult optiliste instrumentide, näiteks mikroskoopide ehitust ja pani aluse <a href="/w/index.php?title=Carl_Zeiss_(ettev%C3%B5te)&action=edit&redlink=1" class="new" title="Carl Zeiss (ettevõte) (pole veel kirjutatud)">Carl Zeissi ettevõttele</a> – juhtivale optikaseadmete tootjale. </p> <div class="mw-heading mw-heading2"><h2 id="Vaata_ka">Vaata ka</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=L%C3%A4%C3%A4ts&veaction=edit&section=6" title="Muuda alaosa "Vaata ka"" class="mw-editsection-visualeditor"><span>muuda</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=L%C3%A4%C3%A4ts&action=edit&section=6" title="Muuda alaosa "Vaata ka" lähteteksti"><span>muuda lähteteksti</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Gravitatsioonil%C3%A4%C3%A4ts" title="Gravitatsioonilääts">Gravitatsioonilääts</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Välislingid"><span id="V.C3.A4lislingid"></span>Välislingid</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=L%C3%A4%C3%A4ts&veaction=edit&section=7" title="Muuda alaosa "Välislingid"" class="mw-editsection-visualeditor"><span>muuda</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=L%C3%A4%C3%A4ts&action=edit&section=7" title="Muuda alaosa "Välislingid" lähteteksti"><span>muuda lähteteksti</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="https://www.htg.tartu.ee/~siim/Materjalid/Geomeetriline_optika.pdf">Henn Voolaid. Geomeetriline optika. Tartu, 2008 – 3.5. Läätsed</a></li></ul> <style data-mw-deduplicate="TemplateStyles:r6724296">.mw-parser-output table.side-box{margin:4px 0;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa)}.mw-parser-output th.side-box-text,.mw-parser-output td.side-box-text{border:none;padding:0.25em 0.9em;width:100%}.mw-parser-output td.side-box-image{border:none;padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output td.side-box-imageright{border:none;padding:2px 0.9em 2px 0;text-align:center}body.skin-minerva .mw-parser-output table.side-box a>img{max-width:none!important}@media(min-width:720px){.mw-parser-output table.side-box{width:238px}.mw-parser-output table.side-box-right{clear:right;float:right;margin-left:1em}.mw-parser-output table.side-box-left{margin-right:1em;border-collapse:collapse}}</style><table role="presentation" class="side-box side-box-right plainlinks sistersitebox"> <tbody><tr> <td class="side-box-image"><span class="noviewer" typeof="mw:File"><a href="/wiki/Fail:Commons-logo.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png" decoding="async" width="30" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/45px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/59px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></a></span></td> <td class="side-box-text">Pildid, videod ja helifailid Commonsis: <b><a class="external text" href="https://commons.wikimedia.org/wiki/Category:Lenses?uselang=et">Kategooria:Läätsed</a></b></td></tr></tbody></table>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Pärit leheküljelt "<a dir="ltr" href="https://et.wikipedia.org/w/index.php?title=Lääts&oldid=5808861">https://et.wikipedia.org/w/index.php?title=Lääts&oldid=5808861</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Eri:Kategooriad" title="Eri:Kategooriad">Kategooria</a>: <ul><li><a href="/wiki/Kategooria:Optika" title="Kategooria:Optika">Optika</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> Selle lehekülje viimane muutmine: 14:42, 28. jaanuar 2021.</li> <li id="footer-info-copyright">Tekst on kasutatav vastavalt Creative Commonsi litsentsile "<a rel="nofollow" class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.et">Autorile viitamine + jagamine samadel tingimustel</a>"; sellele võivad lisanduda täiendavad tingimused. 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