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Tilgængelig på 48 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-48" 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">48 sprog</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%A8%D8%B5%D8%B1%D9%8A%D8%A7%D8%AA_%D9%87%D9%86%D8%AF%D8%B3%D9%8A%D8%A9" title="بصريات هندسية – arabisk" lang="ar" hreflang="ar" data-title="بصريات هندسية" data-language-autonym="العربية" data-language-local-name="arabisk" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%93%D0%B5%D0%B0%D0%BC%D0%B5%D1%82%D1%80%D1%8B%D1%87%D0%BD%D0%B0%D1%8F_%D0%BE%D0%BF%D1%82%D1%8B%D0%BA%D0%B0" title="Геаметрычная оптыка – belarusisk" lang="be" hreflang="be" data-title="Геаметрычная оптыка" data-language-autonym="Беларуская" data-language-local-name="belarusisk" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%BD%D0%B0_%D0%BE%D0%BF%D1%82%D0%B8%D0%BA%D0%B0" title="Геометрична оптика – bulgarsk" lang="bg" hreflang="bg" data-title="Геометрична оптика" data-language-autonym="Български" data-language-local-name="bulgarsk" 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/%C3%92ptica_geom%C3%A8trica" title="Òptica geomètrica – catalansk" lang="ca" hreflang="ca" data-title="Òptica geomètrica" data-language-autonym="Català" data-language-local-name="catalansk" 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/Geometrick%C3%A1_optika" title="Geometrická optika – tjekkisk" lang="cs" hreflang="cs" data-title="Geometrická optika" 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/%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D0%BB%D0%BB%D0%B5_%D0%BE%D0%BF%D1%82%D0%B8%D0%BA%D0%B0" title="Геометрилле оптика – tjuvasjisk" lang="cv" hreflang="cv" data-title="Геометрилле оптика" data-language-autonym="Чӑвашла" data-language-local-name="tjuvasjisk" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Geometrische_Optik" title="Geometrische Optik – tysk" lang="de" hreflang="de" data-title="Geometrische Optik" data-language-autonym="Deutsch" data-language-local-name="tysk" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%93%CE%B5%CF%89%CE%BC%CE%B5%CF%84%CF%81%CE%B9%CE%BA%CE%AE_%CE%BF%CF%80%CF%84%CE%B9%CE%BA%CE%AE" title="Γεωμετρική οπτική – græsk" lang="el" hreflang="el" data-title="Γεωμετρική οπτική" 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/Geometrical_optics" title="Geometrical optics – engelsk" lang="en" hreflang="en" data-title="Geometrical optics" data-language-autonym="English" data-language-local-name="engelsk" 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/%C3%93ptica_geom%C3%A9trica" title="Óptica geométrica – spansk" lang="es" hreflang="es" data-title="Óptica geométrica" 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/Geomeetriline_optika" title="Geomeetriline optika – estisk" lang="et" hreflang="et" data-title="Geomeetriline optika" 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/Optika_geometriko" title="Optika geometriko – baskisk" lang="eu" hreflang="eu" data-title="Optika geometriko" data-language-autonym="Euskara" data-language-local-name="baskisk" 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/%D9%86%D9%88%D8%B1%D8%B4%D9%86%D8%A7%D8%B3%DB%8C_%D9%87%D9%86%D8%AF%D8%B3%DB%8C" title="نورشناسی هندسی – persisk" lang="fa" hreflang="fa" data-title="نورشناسی هندسی" 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/S%C3%A4deoptiikka" title="Sädeoptiikka – finsk" lang="fi" hreflang="fi" data-title="Sädeoptiikka" data-language-autonym="Suomi" data-language-local-name="finsk" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Optique_g%C3%A9om%C3%A9trique" title="Optique géométrique – fransk" lang="fr" hreflang="fr" data-title="Optique géométrique" data-language-autonym="Français" data-language-local-name="fransk" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Optaic_gheoim%C3%A9adrach" title="Optaic gheoiméadrach – irsk" lang="ga" hreflang="ga" data-title="Optaic gheoiméadrach" data-language-autonym="Gaeilge" data-language-local-name="irsk" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%90%D7%95%D7%A4%D7%98%D7%99%D7%A7%D7%94_%D7%92%D7%90%D7%95%D7%9E%D7%98%D7%A8%D7%99%D7%AA" title="אופטיקה גאומטרית – hebraisk" lang="he" hreflang="he" data-title="אופטיקה גאומטרית" 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%9C%E0%A5%8D%E0%A4%AF%E0%A4%BE%E0%A4%AE%E0%A4%BF%E0%A4%A4%E0%A5%80%E0%A4%AF_%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%95%E0%A4%BE%E0%A4%B6%E0%A4%BF%E0%A4%95%E0%A5%80" title="ज्यामितीय प्रकाशिकी – hindi" lang="hi" hreflang="hi" data-title="ज्यामितीय प्रकाशिकी" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Geometrijska_optika" title="Geometrijska optika – kroatisk" lang="hr" hreflang="hr" data-title="Geometrijska optika" data-language-autonym="Hrvatski" data-language-local-name="kroatisk" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Geometriai_optika" title="Geometriai optika – ungarsk" lang="hu" hreflang="hu" data-title="Geometriai optika" 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%B5%D6%80%D5%AF%D6%80%D5%A1%D5%B9%D5%A1%D6%83%D5%A1%D5%AF%D5%A1%D5%B6_%D6%85%D5%BA%D5%BF%D5%AB%D5%AF%D5%A1" title="Երկրաչափական օպտիկա – armensk" lang="hy" hreflang="hy" data-title="Երկրաչափական օպտիկա" data-language-autonym="Հայերեն" data-language-local-name="armensk" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Optika_geometris" title="Optika geometris – indonesisk" lang="id" hreflang="id" data-title="Optika geometris" 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-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Ottica_geometrica" title="Ottica geometrica – italiensk" lang="it" hreflang="it" data-title="Ottica geometrica" 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%B9%BE%E4%BD%95%E5%85%89%E5%AD%A6" title="幾何光学 – japansk" lang="ja" hreflang="ja" data-title="幾何光学" 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-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%8F%D0%BB%D1%8B%D2%9B_%D0%BE%D0%BF%D1%82%D0%B8%D0%BA%D0%B0" title="Геометриялық оптика – kasakhisk" lang="kk" hreflang="kk" data-title="Геометриялық оптика" data-language-autonym="Қазақша" data-language-local-name="kasakhisk" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-kn mw-list-item"><a href="https://kn.wikipedia.org/wiki/%E0%B2%9C%E0%B3%8D%E0%B2%AF%E0%B2%BE%E0%B2%AE%E0%B2%BF%E0%B2%A4%E0%B3%80%E0%B2%AF_%E0%B2%A6%E0%B3%8D%E0%B2%AF%E0%B3%81%E0%B2%A4%E0%B2%BF%E0%B2%B6%E0%B2%BE%E0%B2%B8%E0%B3%8D%E0%B2%B0%E0%B3%8D%E0%B2%A4" title="ಜ್ಯಾಮಿತೀಯ ದ್ಯುತಿಶಾಸ್ರ್ತ – kannada" lang="kn" hreflang="kn" data-title="ಜ್ಯಾಮಿತೀಯ ದ್ಯುತಿಶಾಸ್ರ್ತ" 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/%EA%B8%B0%ED%95%98%EA%B4%91%ED%95%99" title="기하광학 – koreansk" lang="ko" hreflang="ko" data-title="기하광학" data-language-autonym="한국어" data-language-local-name="koreansk" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Geometresch_Optik" title="Geometresch Optik – luxembourgsk" lang="lb" hreflang="lb" data-title="Geometresch Optik" data-language-autonym="Lëtzebuergesch" data-language-local-name="luxembourgsk" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Geometrin%C4%97_optika" title="Geometrinė optika – litauisk" lang="lt" hreflang="lt" data-title="Geometrinė optika" data-language-autonym="Lietuvių" data-language-local-name="litauisk" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%81%D0%BA%D0%B0_%D0%BE%D0%BF%D1%82%D0%B8%D0%BA%D0%B0" title="Геометриска оптика – makedonsk" lang="mk" hreflang="mk" data-title="Геометриска оптика" data-language-autonym="Македонски" data-language-local-name="makedonsk" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Optik_geometri" title="Optik geometri – malajisk" lang="ms" hreflang="ms" data-title="Optik geometri" 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-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Geometrische_optica" title="Geometrische optica – nederlandsk" lang="nl" hreflang="nl" data-title="Geometrische optica" 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/Geometrisk_optikk" title="Geometrisk optikk – nynorsk" lang="nn" hreflang="nn" data-title="Geometrisk optikk" 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-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Optica_geometrica" title="Optica geometrica – occitansk" lang="oc" hreflang="oc" data-title="Optica geometrica" data-language-autonym="Occitan" data-language-local-name="occitansk" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Optyka_geometryczna" title="Optyka geometryczna – polsk" lang="pl" hreflang="pl" data-title="Optyka geometryczna" data-language-autonym="Polski" data-language-local-name="polsk" 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/%C3%93ptica_geom%C3%A9trica" title="Óptica geométrica – portugisisk" lang="pt" hreflang="pt" data-title="Óptica geométrica" data-language-autonym="Português" data-language-local-name="portugisisk" 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/Optic%C4%83_geometric%C4%83" title="Optică geometrică – rumænsk" lang="ro" hreflang="ro" data-title="Optică geometrică" data-language-autonym="Română" data-language-local-name="rumænsk" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F_%D0%BE%D0%BF%D1%82%D0%B8%D0%BA%D0%B0" title="Геометрическая оптика – russisk" lang="ru" hreflang="ru" data-title="Геометрическая оптика" data-language-autonym="Русский" data-language-local-name="russisk" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Geometrijska_optika" title="Geometrijska optika – serbokroatisk" lang="sh" hreflang="sh" data-title="Geometrijska optika" 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-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Geometrijska_optika" title="Geometrijska optika – slovensk" lang="sl" hreflang="sl" data-title="Geometrijska optika" data-language-autonym="Slovenščina" data-language-local-name="slovensk" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Geometrisk_optik" title="Geometrisk optik – svensk" lang="sv" hreflang="sv" data-title="Geometrisk optik" data-language-autonym="Svenska" data-language-local-name="svensk" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%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%E0%B9%80%E0%B8%8A%E0%B8%B4%E0%B8%87%E0%B9%80%E0%B8%A3%E0%B8%82%E0%B8%B2%E0%B8%84%E0%B8%93%E0%B8%B4%E0%B8%95" title="ทัศนศาสตร์เชิงเรขาคณิต – thai" lang="th" hreflang="th" data-title="ทัศนศาสตร์เชิงเรขาคณิต" data-language-autonym="ไทย" data-language-local-name="thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Geometrik_optik" title="Geometrik optik – tyrkisk" lang="tr" hreflang="tr" data-title="Geometrik optik" data-language-autonym="Türkçe" data-language-local-name="tyrkisk" 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%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%BD%D0%B0_%D0%BE%D0%BF%D1%82%D0%B8%D0%BA%D0%B0" title="Геометрична оптика – ukrainsk" lang="uk" hreflang="uk" data-title="Геометрична оптика" 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/%DB%81%D9%86%D8%AF%D8%B3%DB%8C_%D8%A8%D8%B5%D8%B1%DB%8C%D8%A7%D8%AA" title="ہندسی بصریات – urdu" lang="ur" hreflang="ur" data-title="ہندسی بصریات" 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/Geometrik_optika" title="Geometrik optika – usbekisk" lang="uz" hreflang="uz" data-title="Geometrik optika" data-language-autonym="Oʻzbekcha / ўзбекча" 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<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"><figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/Fil:Skitse_af_samlelinsen.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/db/Skitse_af_samlelinsen.png/500px-Skitse_af_samlelinsen.png" decoding="async" width="500" height="237" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/db/Skitse_af_samlelinsen.png/750px-Skitse_af_samlelinsen.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/db/Skitse_af_samlelinsen.png/1000px-Skitse_af_samlelinsen.png 2x" data-file-width="4273" data-file-height="2025" /></a><figcaption>Geometrisk optik er praktisk at forstå linsesystemer med. I denne illustration bruges den til at udlede <a href="/wiki/Linseformlen" title="Linseformlen">linseformlen</a>.</figcaption></figure> <p><b>Geometrisk optik</b> eller <b>stråleoptik</b> er den simpleste <a href="/wiki/Model_(matematik)" title="Model (matematik)">model</a> for <a href="/wiki/Optik" title="Optik">optik</a>, da <a href="/wiki/Lys" title="Lys">lys</a> beskrives som <b>lysstråler</b>, der bevæger sig i <a href="/w/index.php?title=Lige_linje&action=edit&redlink=1" class="new" title="Lige linje (ikke skrevet endnu)">lige linjer</a>. Modellen er brugbar, så længe lyset kun rammer objekter, der er meget større end lysets <a href="/wiki/B%C3%B8lgel%C3%A6ngde" title="Bølgelængde">bølgelængde</a>. Ellers må <a href="/wiki/B%C3%B8lgeoptik" title="Bølgeoptik">bølgeoptikken</a> tages i brug.<sup id="cite_ref-Halliday_1-0" class="reference"><a href="#cite_note-Halliday-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>Lysstråler følger mere præcist den hurtigste vej jf. <a href="/wiki/Fermats_princip" title="Fermats princip">Fermats princip</a>, hvilket også er baggrunden for <a href="/wiki/Snells_lov" title="Snells lov">Snells lov</a>.<sup id="cite_ref-fermat_2-0" class="reference"><a href="#cite_note-fermat-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p> <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=Geometrisk_optik&veaction=edit&section=1" title="Redigér afsnit: Eksterne henvisninger" class="mw-editsection-visualeditor"><span>redigér</span></a><span 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Kildehenvisninger"><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"><ol class="references"> <li id="cite_note-Halliday-1"><span class="mw-cite-backlink"><a href="#cite_ref-Halliday_1-0">^</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="CITEREFHallidayKraneResnick2002" class="citation cs2 cs1-prop-long-vol cs1-prop-foreign-lang-source">Halliday, David; Krane, Kenneth S.; Resnick, Robbert (2002), "Geometrical vs. Wave Optics", <i>Physics</i> (engelsk), vol. bind 2 (5. udgave), John Wiley & Sons, s. 914, <a href="/wiki/Internationalt_Standardbognummer" title="Internationalt Standardbognummer">ISBN</a> <a href="/wiki/Speciel:ISBN-s%C3%B8gning/978-0-471-40194-0" title="Speciel:ISBN-søgning/978-0-471-40194-0"><bdi>978-0-471-40194-0</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Geometrical+vs.+Wave+Optics&rft.btitle=Physics&rft.pages=914&rft.edition=5.&rft.pub=John+Wiley+%26+Sons&rft.date=2002&rft.isbn=978-0-471-40194-0&rft.aulast=Halliday&rft.aufirst=David&rft.au=Krane%2C+Kenneth+S.&rft.au=Resnick%2C+Robbert&rfr_id=info%3Asid%2Fda.wikipedia.org%3AGeometrisk+optik" class="Z3988"></span></span> </li> <li id="cite_note-fermat-2"><span class="mw-cite-backlink"><a href="#cite_ref-fermat_2-0">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite id="CITEREFHaber2009" class="citation cs2">Haber, Howard (2009), <a rel="nofollow" class="external text" href="http://scipp.ucsc.edu/~haber/ph5B/fermat09.pdf">"Fermat's Principle and the Laws of Reflection and Refraction"</a> <span class="cs1-format">(PDF)</span>, <i>scipp.ucsc.edu</i>, <a href="/w/index.php?title=University_of_California,_Santa_Cruz&action=edit&redlink=1" class="new" title="University of California, Santa Cruz (ikke skrevet endnu)">University of California, Santa Cruz</a><span class="reference-accessdate">, hentet 8. juni 2019</span></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=scipp.ucsc.edu&rft.atitle=Fermat%E2%80%99s+Principle+and+the+Laws+of+Reflection+and+Refraction&rft.date=2009&rft.aulast=Haber&rft.aufirst=Howard&rft_id=http%3A%2F%2Fscipp.ucsc.edu%2F~haber%2Fph5B%2Ffermat09.pdf&rfr_id=info%3Asid%2Fda.wikipedia.org%3AGeometrisk+optik" class="Z3988"></span></span> </li> </ol></div></div> <div style="clear:both; visibility:false; display:none"></div><table class="" style="width: 100%; float: none; margin: 0 auto; border-collapse: collapse; background: #FBFBFB; border: 1px solid #aaa; border-left: 10px solid #66bb77;padding: 0.25em 0.5em;"> <tbody><tr><td style="padding: 0.25em 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