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</div> </a> <button aria-controls="toc-Absorption_of_light_in_solids-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Absorption of light in solids subsection</span> </button> <ul id="toc-Absorption_of_light_in_solids-sublist" class="vector-toc-list"> <li id="toc-UV-Vis:_electronic_transitions" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#UV-Vis:_electronic_transitions"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>UV-Vis: electronic transitions</span> </div> </a> <ul id="toc-UV-Vis:_electronic_transitions-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Infrared:_vond_stretching" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Infrared:_vond_stretching"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2</span> <span>Infrared: vond stretching</span> </div> </a> <ul id="toc-Infrared:_vond_stretching-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Transparency_in_insulators" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Transparency_in_insulators"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.3</span> <span>Transparency in insulators</span> </div> </a> <ul id="toc-Transparency_in_insulators-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Optical_waveguides" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Optical_waveguides"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Optical waveguides</span> </div> </a> <button aria-controls="toc-Optical_waveguides-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Optical waveguides subsection</span> </button> <ul id="toc-Optical_waveguides-sublist" class="vector-toc-list"> <li id="toc-Mechanisms_of_attenuation" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Mechanisms_of_attenuation"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1</span> <span>Mechanisms of attenuation</span> </div> </a> <ul id="toc-Mechanisms_of_attenuation-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-As_camouflage" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#As_camouflage"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>As camouflage</span> </div> </a> <ul id="toc-As_camouflage-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Further_reading" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Further_reading"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>Further reading</span> </div> </a> <ul id="toc-Further_reading-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Transparency and translucency</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="Go to an article in another language. Available in 51 languages" > <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-51" 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">51 languages</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/Transparansie_(optika)" title="Transparansie (optika) – Afrikaans" lang="af" hreflang="af" data-title="Transparansie (optika)" data-language-autonym="Afrikaans" data-language-local-name="Afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%B4%D9%81%D8%A7%D9%81%D9%8A%D8%A9_(%D8%A8%D8%B5%D8%B1%D9%8A%D8%A7%D8%AA)" title="شفافية (بصريات) – Arabic" lang="ar" hreflang="ar" data-title="شفافية (بصريات)" data-language-autonym="العربية" data-language-local-name="Arabic" 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%9F%D1%80%D0%B0%D0%B7%D1%80%D1%8B%D1%81%D1%82%D0%B0%D1%81%D1%86%D1%8C" title="Празрыстасць – Belarusian" lang="be" hreflang="be" data-title="Празрыстасць" data-language-autonym="Беларуская" data-language-local-name="Belarusian" 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%9F%D1%80%D0%BE%D0%B7%D1%80%D0%B0%D1%87%D0%BD%D0%BE%D1%81%D1%82" title="Прозрачност – Bulgarian" lang="bg" hreflang="bg" data-title="Прозрачност" data-language-autonym="Български" data-language-local-name="Bulgarian" 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/Transpar%C3%A8ncia" title="Transparència – Catalan" lang="ca" hreflang="ca" data-title="Transparència" data-language-autonym="Català" data-language-local-name="Catalan" 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/Transparentnost_(optika)" title="Transparentnost (optika) – Czech" lang="cs" hreflang="cs" data-title="Transparentnost (optika)" data-language-autonym="Čeština" data-language-local-name="Czech" 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/Transparens_(optik)" title="Transparens (optik) – Danish" lang="da" hreflang="da" data-title="Transparens (optik)" data-language-autonym="Dansk" data-language-local-name="Danish" 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/Transparenz_(Physik)" title="Transparenz (Physik) – German" lang="de" hreflang="de" data-title="Transparenz (Physik)" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/L%C3%A4bipaistvus" title="Läbipaistvus – Estonian" lang="et" hreflang="et" data-title="Läbipaistvus" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%94%CE%B9%CE%B1%CF%86%CE%AC%CE%BD%CE%B5%CE%B9%CE%B1" title="Διαφάνεια – Greek" lang="el" hreflang="el" data-title="Διαφάνεια" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Transparencia_(f%C3%ADsica)" title="Transparencia (física) – Spanish" lang="es" hreflang="es" data-title="Transparencia (física)" data-language-autonym="Español" data-language-local-name="Spanish" 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/Travideblo" title="Travideblo – Esperanto" lang="eo" hreflang="eo" data-title="Travideblo" 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/Gardentasun" title="Gardentasun – Basque" lang="eu" hreflang="eu" data-title="Gardentasun" data-language-autonym="Euskara" data-language-local-name="Basque" 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%B4%D9%81%D8%A7%D9%81" title="شفاف – Persian" lang="fa" hreflang="fa" data-title="شفاف" data-language-autonym="فارسی" data-language-local-name="Persian" 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/Transparence_(physique)" title="Transparence (physique) – French" lang="fr" hreflang="fr" data-title="Transparence (physique)" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Transparencia_(%C3%B3ptica)" title="Transparencia (óptica) – Galician" lang="gl" hreflang="gl" data-title="Transparencia (óptica)" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%ED%88%AC%EB%AA%85" title="투명 – Korean" lang="ko" hreflang="ko" data-title="투명" data-language-autonym="한국어" data-language-local-name="Korean" 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/%D4%B9%D5%A1%D6%83%D5%A1%D5%B6%D6%81%D5%AB%D5%AF%D5%B8%D6%82%D5%A9%D5%B5%D5%B8%D6%82%D5%B6" title="Թափանցիկություն – Armenian" lang="hy" hreflang="hy" data-title="Թափանցիկություն" data-language-autonym="Հայերեն" data-language-local-name="Armenian" 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%AA%E0%A4%BE%E0%A4%B0%E0%A4%A6%E0%A4%B0%E0%A5%8D%E0%A4%B6%E0%A4%BF%E0%A4%A4%E0%A4%BE_%E0%A4%94%E0%A4%B0_%E0%A4%AA%E0%A4%BE%E0%A4%B0%E0%A4%AD%E0%A4%BE%E0%A4%B8%E0%A4%95%E0%A4%A4%E0%A4%BE" title="पारदर्शिता और पारभासकता – Hindi" lang="hi" hreflang="hi" data-title="पारदर्शिता और पारभासकता" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Tembus_pandang_dan_tembus_cahaya" title="Tembus pandang dan tembus cahaya – Indonesian" lang="id" hreflang="id" data-title="Tembus pandang dan tembus cahaya" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-xh mw-list-item"><a href="https://xh.wikipedia.org/wiki/Ukucaca" title="Ukucaca – Xhosa" lang="xh" hreflang="xh" data-title="Ukucaca" data-language-autonym="IsiXhosa" data-language-local-name="Xhosa" class="interlanguage-link-target"><span>IsiXhosa</span></a></li><li class="interlanguage-link interwiki-zu mw-list-item"><a href="https://zu.wikipedia.org/wiki/Ukuba_luntwentwe" title="Ukuba luntwentwe – Zulu" lang="zu" hreflang="zu" data-title="Ukuba luntwentwe" data-language-autonym="IsiZulu" data-language-local-name="Zulu" class="interlanguage-link-target"><span>IsiZulu</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Trasparenza_e_traslucenza" title="Trasparenza e traslucenza – Italian" lang="it" hreflang="it" data-title="Trasparenza e traslucenza" data-language-autonym="Italiano" data-language-local-name="Italian" 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%A9%D7%A7%D7%99%D7%A4%D7%95%D7%AA_(%D7%90%D7%95%D7%A4%D7%98%D7%99%D7%A7%D7%94)" title="שקיפות (אופטיקה) – Hebrew" lang="he" hreflang="he" data-title="שקיפות (אופטיקה)" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Caursp%C4%ABd%C4%ABgums_(optika)" title="Caurspīdīgums (optika) – Latvian" lang="lv" hreflang="lv" data-title="Caurspīdīgums (optika)" data-language-autonym="Latviešu" data-language-local-name="Latvian" 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/Skaidrumas" title="Skaidrumas – Lithuanian" lang="lt" hreflang="lt" data-title="Skaidrumas" data-language-autonym="Lietuvių" data-language-local-name="Lithuanian" 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%9F%D1%80%D0%BE%D1%95%D0%B8%D1%80%D0%BD%D0%BE%D1%81%D1%82" title="Проѕирност – Macedonian" lang="mk" hreflang="mk" data-title="Проѕирност" data-language-autonym="Македонски" data-language-local-name="Macedonian" 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/Kelutsinaran_dan_kelutcahayaan" title="Kelutsinaran dan kelutcahayaan – Malay" lang="ms" hreflang="ms" data-title="Kelutsinaran dan kelutcahayaan" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" 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/Transparantie_(optiek)" title="Transparantie (optiek) – Dutch" lang="nl" hreflang="nl" data-title="Transparantie (optiek)" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E9%80%8F%E6%98%8E" title="透明 – Japanese" lang="ja" hreflang="ja" data-title="透明" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Transparens" title="Transparens – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Transparens" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian 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/Transparens" title="Transparens – Norwegian Nynorsk" lang="nn" hreflang="nn" data-title="Transparens" data-language-autonym="Norsk nynorsk" data-language-local-name="Norwegian Nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Shaffoflik" title="Shaffoflik – Uzbek" lang="uz" hreflang="uz" data-title="Shaffoflik" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="Uzbek" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-nds mw-list-item"><a href="https://nds.wikipedia.org/wiki/Transparenz" title="Transparenz – Low German" lang="nds" hreflang="nds" data-title="Transparenz" data-language-autonym="Plattdüütsch" data-language-local-name="Low German" class="interlanguage-link-target"><span>Plattdüütsch</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Przezroczysto%C5%9B%C4%87" title="Przezroczystość – Polish" lang="pl" hreflang="pl" data-title="Przezroczystość" data-language-autonym="Polski" data-language-local-name="Polish" 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/Transpar%C3%AAncia" title="Transparência – Portuguese" lang="pt" hreflang="pt" data-title="Transparência" data-language-autonym="Português" data-language-local-name="Portuguese" 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/Transparen%C8%9B%C4%83" title="Transparență – Romanian" lang="ro" hreflang="ro" data-title="Transparență" data-language-autonym="Română" data-language-local-name="Romanian" 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/Q%27ispi_kay" title="Q'ispi kay – Quechua" lang="qu" hreflang="qu" data-title="Q'ispi kay" data-language-autonym="Runa Simi" data-language-local-name="Quechua" class="interlanguage-link-target"><span>Runa Simi</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9F%D1%80%D0%BE%D0%B7%D1%80%D0%B0%D1%87%D0%BD%D0%BE%D1%81%D1%82%D1%8C_%D1%81%D1%80%D0%B5%D0%B4%D1%8B" title="Прозрачность среды – Russian" lang="ru" hreflang="ru" data-title="Прозрачность среды" data-language-autonym="Русский" data-language-local-name="Russian" 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/Tejdukshm%C3%ABria_dhe_tejdrit%C3%ABsia" title="Tejdukshmëria dhe tejdritësia – Albanian" lang="sq" hreflang="sq" data-title="Tejdukshmëria dhe tejdritësia" data-language-autonym="Shqip" data-language-local-name="Albanian" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Transparency" title="Transparency – Simple English" lang="en-simple" hreflang="en-simple" data-title="Transparency" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Prozornost" title="Prozornost – Slovenian" lang="sl" hreflang="sl" data-title="Prozornost" data-language-autonym="Slovenščina" data-language-local-name="Slovenian" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/L%C3%A4pin%C3%A4kyvyys" title="Läpinäkyvyys – Finnish" lang="fi" hreflang="fi" data-title="Läpinäkyvyys" data-language-autonym="Suomi" 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id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Property of an object or substance to transmit light with minimal scattering</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">For other uses of "Transparency", see <a href="/wiki/Transparency_(disambiguation)" class="mw-redirect mw-disambig" title="Transparency (disambiguation)">Transparency (disambiguation)</a>.</div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Dichroic_filters.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/49/Dichroic_filters.jpg/220px-Dichroic_filters.jpg" decoding="async" width="220" height="144" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/49/Dichroic_filters.jpg/330px-Dichroic_filters.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/49/Dichroic_filters.jpg/440px-Dichroic_filters.jpg 2x" data-file-width="627" data-file-height="411" /></a><figcaption><a href="/wiki/Dichroic_filter" class="mw-redirect" title="Dichroic filter">Dichroic filters</a> are created using optically transparent materials.</figcaption></figure> <p>In the field of <a href="/wiki/Optics" title="Optics">optics</a>, <b>transparency</b> (also called <b>pellucidity</b> or <b>diaphaneity</b>) is the <a href="/wiki/Physical_property" title="Physical property">physical property</a> of allowing <a href="/wiki/Light" title="Light">light</a> to pass through the material without appreciable <a href="/wiki/Light_scattering_by_particles" title="Light scattering by particles">scattering of light</a>. On a <a href="/wiki/Macroscopic_scale" title="Macroscopic scale">macroscopic scale</a> (one in which the dimensions are much larger than the wavelengths of the <a href="/wiki/Photon" title="Photon">photons</a> in question), the photons can be said to follow <a href="/wiki/Snell%27s_law" title="Snell's law">Snell's law</a>. <b>Translucency</b> (also called <b>translucence</b> or <b>translucidity</b>) allows light to pass through but does not necessarily (again, on the macroscopic scale) follow Snell's law; the photons can be scattered at either of the two interfaces, or internally, where there is a change in the index of <a href="/wiki/Refraction" title="Refraction">refraction</a>. In other words, a translucent material is made up of components with different indices of refraction. A transparent material is made up of components with a uniform index of refraction.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Transparent materials appear clear, with the overall appearance of one color, or any combination leading up to a brilliant <a href="/wiki/Spectrum" title="Spectrum">spectrum</a> of every color. The opposite property of translucency is <a href="/wiki/Opacity_(optics)" class="mw-redirect" title="Opacity (optics)">opacity</a>. Other categories of visual appearance, related to the perception of regular or diffuse reflection and transmission of light, have been organized under the concept of <a href="/wiki/Cesia_(visual_appearance)" title="Cesia (visual appearance)">cesia</a> in an order system with three variables, including transparency, translucency and opacity among the involved aspects. </p><p>When light encounters a material, it can interact with it in several different ways. These interactions depend on the <a href="/wiki/Wavelength" title="Wavelength">wavelength</a> of the light and the nature of the material. Photons interact with an object by some combination of reflection, absorption and transmission. Some materials, such as <a href="/wiki/Plate_glass" title="Plate glass">plate glass</a> and clean <a href="/wiki/Water" title="Water">water</a>, transmit much of the light that falls on them and reflect little of it; such materials are called optically transparent. Many liquids and aqueous solutions are highly transparent. Absence of structural defects (voids, cracks, etc.) and molecular structure of most liquids are mostly responsible for excellent optical transmission. </p><p>Materials that do not <a href="/wiki/Transmittance" title="Transmittance">transmit</a> light are called <a href="/wiki/Opacity_(optics)" class="mw-redirect" title="Opacity (optics)">opaque</a>. Many such substances have a <a href="/wiki/Chemical_composition" title="Chemical composition">chemical composition</a> which includes what are referred to as <a href="/wiki/Absorption_(electromagnetic_radiation)" title="Absorption (electromagnetic radiation)">absorption</a> centers. Many substances are selective in their absorption of <a href="/wiki/Solar_Light" class="mw-redirect" title="Solar Light">white light</a> <a href="/wiki/Frequencies" class="mw-redirect" title="Frequencies">frequencies</a>. They absorb certain portions of the <a href="/wiki/Visible_spectrum" title="Visible spectrum">visible spectrum</a> while reflecting others. The frequencies of the spectrum which are not absorbed are either reflected or transmitted for our physical observation. This is what gives rise to <a href="/wiki/Color" title="Color">color</a>. The attenuation of light of all frequencies and wavelengths is due to the combined mechanisms of absorption and <a href="/wiki/Light_scattering_in_liquids_and_solids" class="mw-redirect" title="Light scattering in liquids and solids">scattering</a>.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p><p>Transparency can provide almost perfect <a href="/wiki/Camouflage" title="Camouflage">camouflage</a> for animals able to achieve it. This is easier in dimly-lit or turbid <a href="/wiki/Sea" title="Sea">seawater</a> than in good illumination. Many <a href="/wiki/Marine_biology" title="Marine biology">marine animals</a> such as <a href="/wiki/Jellyfish" title="Jellyfish">jellyfish</a> are highly transparent. </p> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Opacity_Translucency_Transparency.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Opacity_Translucency_Transparency.svg/250px-Opacity_Translucency_Transparency.svg.png" decoding="async" width="250" height="353" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Opacity_Translucency_Transparency.svg/375px-Opacity_Translucency_Transparency.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Opacity_Translucency_Transparency.svg/500px-Opacity_Translucency_Transparency.svg.png 2x" data-file-width="744" data-file-height="1052" /></a><figcaption>Comparisons of 1. opacity, 2. translucency, and 3. transparency; behind each panel (from top to bottom: grey, red, white) is a star.</figcaption></figure> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Etymology">Etymology</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Transparency_and_translucency&action=edit&section=1" title="Edit section: Etymology"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>late Middle English: from Old French, from medieval Latin <span title="Latin-language text"><i lang="la">transparent</i></span>- 'visible through', from Latin <span title="Latin-language text"><i lang="la">transparere</i></span>, from <span title="Latin-language text"><i lang="la">trans</i></span>- 'through' + <span title="Latin-language text"><i lang="la">parere</i></span> 'be visible'.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (April 2021)">citation needed</span></a></i>]</sup></li> <li>late 16th century (in the Latin sense): from Latin <span title="Latin-language text"><i lang="la">translucent</i></span>- 'shining through', from the verb <span title="Latin-language text"><i lang="la">translucere</i></span>, from <span title="Latin-language text"><i lang="la">trans</i></span>- 'through' + <span title="Latin-language text"><i lang="la">lucere</i></span> 'to shine'.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (April 2021)">citation needed</span></a></i>]</sup></li> <li>late Middle English <span title="Middle English (1100-1500)-language text"><i lang="enm">opake</i></span>, from Latin <span title="Latin-language text"><i lang="la">opacus</i></span> 'darkened'. The current spelling (rare before the 19th century) has been influenced by the French form.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (April 2021)">citation needed</span></a></i>]</sup></li></ul> <div class="mw-heading mw-heading2"><h2 id="Introduction">Introduction</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Transparency_and_translucency&action=edit&section=2" title="Edit section: Introduction"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1251242444">.mw-parser-output .ambox{border:1px solid #a2a9b1;border-left:10px solid #36c;background-color:#fbfbfb;box-sizing:border-box}.mw-parser-output .ambox+link+.ambox,.mw-parser-output .ambox+link+style+.ambox,.mw-parser-output .ambox+link+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}.mw-parser-output .ambox-speedy{border-left:10px solid #b32424;background-color:#fee7e6}.mw-parser-output .ambox-delete{border-left:10px solid #b32424}.mw-parser-output .ambox-content{border-left:10px solid #f28500}.mw-parser-output .ambox-style{border-left:10px solid #fc3}.mw-parser-output .ambox-move{border-left:10px solid #9932cc}.mw-parser-output .ambox-protection{border-left:10px solid #a2a9b1}.mw-parser-output .ambox .mbox-text{border:none;padding:0.25em 0.5em;width:100%}.mw-parser-output .ambox .mbox-image{border:none;padding:2px 0 2px 0.5em;text-align:center}.mw-parser-output .ambox .mbox-imageright{border:none;padding:2px 0.5em 2px 0;text-align:center}.mw-parser-output .ambox .mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox .mbox-image-div{width:52px}@media(min-width:720px){.mw-parser-output .ambox{margin:0 10%}}@media print{body.ns-0 .mw-parser-output .ambox{display:none!important}}</style><table class="box-More_citations_needed_section plainlinks metadata ambox ambox-content ambox-Refimprove" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Question_book-new.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/50px-Question_book-new.svg.png" decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/75px-Question_book-new.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/100px-Question_book-new.svg.png 2x" data-file-width="512" data-file-height="399" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This section <b>needs additional citations for <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">verification</a></b>.<span class="hide-when-compact"> Please help <a href="/wiki/Special:EditPage/Transparency_and_translucency" title="Special:EditPage/Transparency and translucency">improve this article</a> by <a href="/wiki/Help:Referencing_for_beginners" title="Help:Referencing for beginners">adding citations to reliable sources</a> in this section. Unsourced material may be challenged and removed.</span> <span class="date-container"><i>(<span class="date">April 2021</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <p>With regard to the absorption of light, primary material considerations include: </p> <ul><li>At the electronic level, absorption in the <a href="/wiki/Ultraviolet" title="Ultraviolet">ultraviolet</a> and visible (UV-Vis) portions of the spectrum depends on whether the <a href="/wiki/Atomic_orbital" title="Atomic orbital">electron orbitals</a> are spaced (or "quantized") such that electrons can absorb a <a href="/wiki/Quantum" title="Quantum">quantum</a> of light (or <a href="/wiki/Photon" title="Photon">photon</a>) of a specific <a href="/wiki/Frequency" title="Frequency">frequency</a>. For example, in most glasses, electrons have no available energy levels above them in the range of that associated with visible light, or if they do, the transition to them would violate <a href="/wiki/Selection_rules" class="mw-redirect" title="Selection rules">selection rules</a>, meaning there is no appreciable absorption in pure (undoped) glasses, making them ideal transparent materials for windows in buildings.</li> <li>At the atomic or molecular level, physical absorption in the infrared portion of the spectrum depends on the <a href="/wiki/Frequencies" class="mw-redirect" title="Frequencies">frequencies</a> of atomic or <a href="/wiki/Molecular_vibrations" class="mw-redirect" title="Molecular vibrations">molecular vibrations</a> or <a href="/wiki/Chemical_bonds" class="mw-redirect" title="Chemical bonds">chemical bonds</a>, and on <a href="/wiki/Selection_rule" title="Selection rule">selection rules</a>. Nitrogen and oxygen are not greenhouse gases because there is no <a href="/wiki/Molecular_dipole_moment" class="mw-redirect" title="Molecular dipole moment">molecular dipole moment</a>.</li></ul> <p>With regard to the <a href="/wiki/Light_scattering_in_liquids_and_solids" class="mw-redirect" title="Light scattering in liquids and solids">scattering of light</a>, the most critical factor is the length scale of any or all of these structural features relative to the wavelength of the light being scattered. Primary material considerations include: </p> <ul><li>Crystalline structure: whether the atoms or molecules exhibit the 'long-range order' evidenced in crystalline solids.</li> <li>Glassy structure: Scattering centers include fluctuations in density or composition.</li> <li><a href="/wiki/Microstructure" title="Microstructure">Microstructure</a>: Scattering centers include internal surfaces such as grain boundaries, <a href="/wiki/Crystallographic_defect" title="Crystallographic defect">crystallographic defects</a>, and microscopic pores.</li> <li>Organic materials: Scattering centers include fiber and cell structures and boundaries.</li></ul> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Light_scattering" class="mw-redirect" title="Light scattering">Light scattering</a></div> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Diffuse_refl.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f4/Diffuse_refl.gif/250px-Diffuse_refl.gif" decoding="async" width="250" height="259" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f4/Diffuse_refl.gif/375px-Diffuse_refl.gif 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f4/Diffuse_refl.gif/500px-Diffuse_refl.gif 2x" data-file-width="660" data-file-height="683" /></a><figcaption>General mechanism of <b>diffuse reflection</b></figcaption></figure> <p><a href="/wiki/Diffuse_reflection" title="Diffuse reflection">Diffuse reflection</a> - Generally, when light strikes the surface of a (non-metallic and non-glassy) solid material, it bounces off in all directions due to multiple reflections by the microscopic irregularities <i>inside</i> the material (e.g., the <a href="/wiki/Grain_boundaries" class="mw-redirect" title="Grain boundaries">grain boundaries</a> of a <a href="/wiki/Polycrystalline" class="mw-redirect" title="Polycrystalline">polycrystalline</a> material or the <a href="/wiki/Cell_(biology)" title="Cell (biology)">cell</a> or <a href="/wiki/Fiber" title="Fiber">fiber</a> boundaries of an organic material), and by its surface, if it is rough. Diffuse reflection is typically characterized by omni-directional reflection angles. Most of the objects visible to the naked eye are identified via diffuse reflection. Another term commonly used for this type of reflection is "light scattering". Light scattering from the surfaces of objects is our primary mechanism of physical observation.<sup id="cite_ref-z_3-0" class="reference"><a href="#cite_note-z-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-y_4-0" class="reference"><a href="#cite_note-y-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p><p>Light scattering in liquids and solids depends on the wavelength of the light being scattered. Limits to spatial scales of visibility (using white light) therefore arise, depending on the frequency of the light wave and the physical <a href="/wiki/Dimension" title="Dimension">dimension</a> (or spatial scale) of the scattering center. Visible light has a wavelength scale on the order of 0.5 <a href="/wiki/Micrometre" title="Micrometre">μm</a>. Scattering centers (or particles) as small as 1 μm have been observed directly in the light <a href="/wiki/Microscope" title="Microscope">microscope</a> (e.g., <a href="/wiki/Brownian_motion" title="Brownian motion">Brownian motion</a>).<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Transparent_ceramics">Transparent ceramics</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Transparency_and_translucency&action=edit&section=3" title="Edit section: Transparent ceramics"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Optical transparency in polycrystalline materials is limited by the amount of light scattered by their microstructural features. Light scattering depends on the wavelength of the light. Limits to spatial scales of visibility (using white light) therefore arise, depending on the frequency of the light wave and the physical dimension of the scattering center. For example, since visible light has a wavelength scale on the order of a micrometre, scattering centers will have dimensions on a similar spatial scale. Primary scattering centers in polycrystalline materials include microstructural defects such as pores and grain boundaries. In addition to pores, most of the interfaces in a typical metal or ceramic object are in the form of <a href="/wiki/Grain_boundary" title="Grain boundary">grain boundaries</a>, which separate tiny regions of crystalline order. When the size of the scattering center (or grain boundary) is reduced below the size of the wavelength of the light being scattered, the scattering no longer occurs to any significant extent. </p><p>In the formation of polycrystalline materials (metals and ceramics) the size of the crystalline grains is determined largely by the size of the crystalline particles present in the raw material during formation (or pressing) of the object. Moreover, the size of the grain boundaries scales directly with particle size. Thus, a reduction of the original particle size well below the wavelength of visible light (about 1/15 of the light wavelength, or roughly 600 nm / 15 = 40 <a href="/wiki/Nanometre" title="Nanometre">nm</a>) eliminates much of the light scattering, resulting in a translucent or even transparent material. </p><p>Computer modeling of light transmission through translucent ceramic alumina has shown that microscopic pores trapped near grain boundaries act as primary scattering centers. The volume fraction of porosity had to be reduced below 1% for high-quality optical transmission (99.99 percent of theoretical density). This goal has been readily accomplished and amply demonstrated in laboratories and research facilities worldwide using the emerging chemical processing methods encompassed by the methods of <a href="/wiki/Sol-gel" class="mw-redirect" title="Sol-gel">sol-gel</a> chemistry and <a href="/wiki/Nanotechnology" title="Nanotechnology">nanotechnology</a>.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Backlit_mushroom.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/75/Backlit_mushroom.jpg/220px-Backlit_mushroom.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/75/Backlit_mushroom.jpg/330px-Backlit_mushroom.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/75/Backlit_mushroom.jpg/440px-Backlit_mushroom.jpg 2x" data-file-width="1472" data-file-height="1104" /></a><figcaption>Translucency of a material being used to highlight the structure of a mushroom</figcaption></figure> <p><a href="/wiki/Transparent_ceramic" class="mw-redirect" title="Transparent ceramic">Transparent ceramics</a> have created interest in their applications for high energy lasers, transparent armor windows, nose cones for heat seeking missiles, radiation detectors for non-destructive testing, high energy physics, space exploration, security and medical imaging applications. Large <a href="/wiki/Laser" title="Laser">laser</a> elements made from transparent ceramics can be produced at a relatively low cost. These components are free of internal <a href="/wiki/Stress_(mechanics)" title="Stress (mechanics)">stress</a> or intrinsic <a href="/wiki/Birefringence" title="Birefringence">birefringence</a>, and allow relatively large doping levels or optimized custom-designed doping profiles. This makes ceramic laser elements particularly important for high-energy lasers. </p><p>The development of transparent panel products will have other potential advanced applications including high strength, impact-resistant materials that can be used for domestic windows and skylights. Perhaps more important is that walls and other applications will have improved overall strength, especially for high-shear conditions found in high seismic and wind exposures. If the expected improvements in mechanical properties bear out, the traditional limits seen on glazing areas in today's building codes could quickly become outdated if the window area actually contributes to the shear resistance of the wall. </p><p>Currently available infrared transparent materials typically exhibit a trade-off between optical performance, mechanical strength and price. For example, <a href="/wiki/Sapphire" title="Sapphire">sapphire</a> (crystalline <a href="/wiki/Alumina" class="mw-redirect" title="Alumina">alumina</a>) is very strong, but it is expensive and lacks full transparency throughout the 3–5 μm mid-infrared range. <a href="/wiki/Yttria" class="mw-redirect" title="Yttria">Yttria</a> is fully transparent from 3–5 μm, but lacks sufficient strength, hardness, and thermal shock resistance for high-performance aerospace applications. A combination of these two materials in the form of the <a href="/wiki/Yttrium_aluminium_garnet" title="Yttrium aluminium garnet">yttrium aluminium garnet</a> (YAG) is one of the top performers in the field.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (August 2022)">citation needed</span></a></i>]</sup> </p> <div class="mw-heading mw-heading2"><h2 id="Absorption_of_light_in_solids">Absorption of light in solids</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Transparency_and_translucency&action=edit&section=4" title="Edit section: Absorption of light in solids"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1251242444"><table class="box-More_citations_needed_section plainlinks metadata ambox ambox-content ambox-Refimprove" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Question_book-new.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/50px-Question_book-new.svg.png" decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/75px-Question_book-new.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/100px-Question_book-new.svg.png 2x" data-file-width="512" data-file-height="399" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This section <b>needs additional citations for <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">verification</a></b>.<span class="hide-when-compact"> Please help <a href="/wiki/Special:EditPage/Transparency_and_translucency" title="Special:EditPage/Transparency and translucency">improve this article</a> by <a href="/wiki/Help:Referencing_for_beginners" title="Help:Referencing for beginners">adding citations to reliable sources</a> in this section. Unsourced material may be challenged and removed.</span> <span class="date-container"><i>(<span class="date">April 2021</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <p>When light strikes an object, it usually has not just a single frequency (or wavelength) but many. Objects have a tendency to selectively absorb, reflect, or transmit light of certain frequencies. That is, one object might reflect green light while absorbing all other frequencies of visible light. Another object might selectively transmit blue light while absorbing all other frequencies of visible light. The manner in which visible light interacts with an object is dependent upon the frequency of the light, the nature of the atoms in the object, and often, the nature of the <a href="/wiki/Electron" title="Electron">electrons</a> in the <a href="/wiki/Atom" title="Atom">atoms</a> of the object. </p><p>Some materials allow much of the light that falls on them to be transmitted through the material without being reflected. Materials that allow the transmission of light waves through them are called optically transparent. Chemically pure (undoped) window glass and clean river or spring water are prime examples of this. </p><p>Materials that do not allow the transmission of any light wave frequencies are called <a href="/wiki/Opacity_(optics)" class="mw-redirect" title="Opacity (optics)">opaque</a>. Such substances may have a chemical composition which includes what are referred to as absorption centers. Most materials are composed of materials that are selective in their absorption of light frequencies. Thus they absorb only certain portions of the visible spectrum. The frequencies of the spectrum which are not absorbed are either reflected back or transmitted for our physical observation. In the visible portion of the spectrum, this is what gives rise to color.<sup id="cite_ref-bbbb_8-0" class="reference"><a href="#cite_note-bbbb-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-aaaa_9-0" class="reference"><a href="#cite_note-aaaa-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p><p>Absorption centers are largely responsible for the appearance of specific wavelengths of visible light all around us. Moving from longer (0.7 μm) to shorter (0.4 μm) wavelengths: Red, orange, yellow, green, and blue (ROYGB) can all be identified by our senses in the appearance of color by the selective absorption of specific light wave frequencies (or wavelengths). Mechanisms of selective light wave absorption include: </p> <ul><li>Electronic: Transitions in electron <a href="/wiki/Energy_levels" class="mw-redirect" title="Energy levels">energy levels</a> within the atom (e.g., <a href="/wiki/Pigments" class="mw-redirect" title="Pigments">pigments</a>). These transitions are typically in the ultraviolet (UV) and/or visible portions of the spectrum.</li> <li>Vibrational: <a href="/wiki/Resonance" title="Resonance">Resonance</a> in atomic/molecular <a href="/wiki/Vibrational_modes" class="mw-redirect" title="Vibrational modes">vibrational modes</a>. These transitions are typically in the infrared portion of the spectrum.</li></ul> <div class="mw-heading mw-heading3"><h3 id="UV-Vis:_electronic_transitions">UV-Vis: electronic transitions</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Transparency_and_translucency&action=edit&section=5" title="Edit section: UV-Vis: electronic transitions"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In electronic absorption, the frequency of the incoming light wave is at or near the energy levels of the electrons within the atoms that compose the substance. In this case, the electrons will absorb the energy of the light wave and increase their energy state, often moving outward from the <a href="/wiki/Atomic_nucleus" title="Atomic nucleus">nucleus</a> of the atom into an outer shell or <a href="/wiki/Atomic_orbital" title="Atomic orbital">orbital</a>. </p><p>The atoms that bind together to make the molecules of any particular substance contain a number of electrons (given by the <a href="/wiki/Atomic_number" title="Atomic number">atomic number</a> Z in the <a href="/wiki/Periodic_table" title="Periodic table">periodic table</a>). Recall that all light waves are electromagnetic in origin. Thus they are affected strongly when coming into contact with <a href="/wiki/Negatively_charged" class="mw-redirect" title="Negatively charged">negatively charged</a> electrons in matter. When <a href="/wiki/Photons" class="mw-redirect" title="Photons">photons</a> (individual packets of light energy) come in contact with the <a href="/wiki/Valence_electrons" class="mw-redirect" title="Valence electrons">valence electrons</a> of an atom, one of several things can and will occur: </p> <ul><li>A molecule absorbs the photon, some of the energy may be lost via <a href="/wiki/Luminescence" title="Luminescence">luminescence</a>, <a href="/wiki/Fluorescence" title="Fluorescence">fluorescence</a> and <a href="/wiki/Phosphorescence" title="Phosphorescence">phosphorescence</a>.</li> <li>A molecule absorbs the photon, which results in reflection or scattering.</li> <li>A molecule cannot absorb the energy of the photon and the photon continues on its path. This results in transmission (provided no other absorption mechanisms are active).</li></ul> <p>Most of the time, it is a combination of the above that happens to the light that hits an object. The states in different materials vary in the range of energy that they can absorb. Most glasses, for example, block ultraviolet (UV) light. What happens is the electrons in the glass absorb the energy of the photons in the UV range while ignoring the weaker energy of photons in the visible light spectrum. But there are also existing special <a href="/wiki/Glass" title="Glass">glass</a> types, like special types of <a href="/wiki/Borosilicate_glass" title="Borosilicate glass">borosilicate glass</a> or quartz that are UV-permeable and thus allow a high transmission of ultraviolet light. </p><p>Thus, when a material is illuminated, individual photons of light can make the <a href="/wiki/Valence_electron" title="Valence electron">valence electrons</a> of an atom transition to a higher electronic <a href="/wiki/Energy_level" title="Energy level">energy level</a>. The photon is destroyed in the process and the absorbed radiant energy is transformed to electric potential energy. Several things can happen, then, to the absorbed energy: It may be re-emitted by the electron as <a href="/wiki/Radiant_energy" title="Radiant energy">radiant energy</a> (in this case, the overall effect is in fact a scattering of light), dissipated to the rest of the material (i.e., transformed into <a href="/wiki/Heat" title="Heat">heat</a>), or the electron can be freed from the atom (as in the <a href="/wiki/Photoelectric_effect" title="Photoelectric effect">photoelectric effects</a> and <a href="/wiki/Compton_scattering" title="Compton scattering">Compton effects</a>). </p> <div class="mw-heading mw-heading3"><h3 id="Infrared:_vond_stretching">Infrared: vond stretching</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Transparency_and_translucency&action=edit&section=6" title="Edit section: Infrared: vond stretching"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:1D_normal_modes_(280_kB).gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/9b/1D_normal_modes_%28280_kB%29.gif/250px-1D_normal_modes_%28280_kB%29.gif" decoding="async" width="250" height="250" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/9/9b/1D_normal_modes_%28280_kB%29.gif 1.5x" data-file-width="275" data-file-height="275" /></a><figcaption>Normal modes of vibration in a crystalline solid</figcaption></figure> <p>The primary physical mechanism for storing mechanical energy of motion in condensed matter is through <a href="/wiki/Heat" title="Heat">heat</a>, or <a href="/wiki/Thermal_energy" title="Thermal energy">thermal energy</a>. Thermal energy manifests itself as energy of motion. Thus, heat is motion at the atomic and molecular levels. The primary mode of motion in <a href="/wiki/Crystalline" class="mw-redirect" title="Crystalline">crystalline</a> substances is <a href="/wiki/Vibration" title="Vibration">vibration</a>. Any given atom will vibrate around some <a href="/wiki/Mean" title="Mean">mean</a> or average <a href="/wiki/Position_(vector)" class="mw-redirect" title="Position (vector)">position</a> within a crystalline structure, surrounded by its nearest neighbors. This vibration in two dimensions is equivalent to the <a href="/wiki/Oscillation" title="Oscillation">oscillation</a> of a clock's pendulum. It swings back and forth <a href="/wiki/Symmetrical" class="mw-redirect" title="Symmetrical">symmetrically</a> about some mean or average (vertical) position. Atomic and molecular vibrational frequencies may average on the order of 10<sup>12</sup> <a href="/wiki/Cycles_per_second" class="mw-redirect" title="Cycles per second">cycles per second</a> (<a href="/wiki/Terahertz_radiation#Natural" title="Terahertz radiation">Terahertz radiation</a>). </p><p>When a light wave of a given frequency strikes a material with particles having the same or (resonant) vibrational frequencies, those particles will absorb the energy of the light wave and transform it into thermal energy of vibrational motion. Since different atoms and molecules have different natural frequencies of vibration, they will selectively absorb different frequencies (or portions of the spectrum) of infrared light. Reflection and transmission of light waves occur because the frequencies of the light waves do not match the natural resonant frequencies of vibration of the objects. When infrared light of these frequencies strikes an object, the energy is reflected or transmitted. </p><p>If the object is transparent, then the light waves are passed on to neighboring atoms through the bulk of the material and re-emitted on the opposite side of the object. Such frequencies of light waves are said to be transmitted.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Transparency_in_insulators">Transparency in insulators</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Transparency_and_translucency&action=edit&section=7" title="Edit section: Transparency in insulators"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>An object may be not transparent either because it reflects the incoming light or because it absorbs the incoming light. Almost all solids reflect a part and absorb a part of the incoming light. </p><p>When light falls onto a block of <a href="/wiki/Metal" title="Metal">metal</a>, it encounters atoms that are tightly packed in a regular <a href="/wiki/Lattice_model_(physics)" title="Lattice model (physics)">lattice</a> and a "<a href="/wiki/Sea_of_electrons" class="mw-redirect" title="Sea of electrons">sea of electrons</a>" moving randomly between the atoms.<sup id="cite_ref-X_12-0" class="reference"><a href="#cite_note-X-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> In metals, most of these are non-bonding electrons (or free electrons) as opposed to the bonding electrons typically found in covalently bonded or ionically bonded non-metallic (insulating) solids. In a metallic bond, any potential bonding electrons can easily be lost by the atoms in a crystalline structure. The effect of this delocalization is simply to exaggerate the effect of the "sea of electrons". As a result of these electrons, most of the incoming light in metals is reflected back, which is why we see a <a href="/wiki/Reflection_(physics)" title="Reflection (physics)">shiny</a> metal surface. </p><p>Most <a href="/wiki/Insulator_(electricity)" title="Insulator (electricity)">insulators</a> (or <a href="/wiki/Dielectric" title="Dielectric">dielectric</a> materials) are held together by <a href="/wiki/Ionic_bond" class="mw-redirect" title="Ionic bond">ionic bonds</a>. Thus, these materials do not have free <a href="/wiki/Conduction_electrons" class="mw-redirect" title="Conduction electrons">conduction electrons</a>, and the bonding electrons reflect only a small fraction of the incident wave. The remaining frequencies (or wavelengths) are free to propagate (or be transmitted). This class of materials includes all <a href="/wiki/Ceramic_materials" class="mw-redirect" title="Ceramic materials">ceramics</a> and <a href="/wiki/Glass" title="Glass">glasses</a>. </p><p>If a dielectric material does not include light-absorbent additive molecules (pigments, dyes, colorants), it is usually transparent to the spectrum of visible light. Color centers (or dye molecules, or "<a href="/wiki/Dopant" title="Dopant">dopants</a>") in a dielectric absorb a portion of the incoming light. The remaining frequencies (or wavelengths) are free to be reflected or transmitted. This is how colored glass is produced. </p><p>Most liquids and aqueous solutions are highly transparent. For example, water, cooking oil, rubbing alcohol, air, and natural gas are all clear. Absence of structural defects (voids, cracks, etc.) and molecular structure of most liquids are chiefly responsible for their excellent optical transmission. The ability of liquids to "heal" internal defects via viscous flow is one of the reasons why some fibrous materials (e.g., paper or fabric) increase their apparent transparency when wetted. The liquid fills up numerous voids making the material more structurally homogeneous.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (July 2013)">citation needed</span></a></i>]</sup> </p><p>Light scattering in an ideal defect-free <a href="/wiki/Crystalline" class="mw-redirect" title="Crystalline">crystalline</a> (non-metallic) solid that provides <i>no scattering centers</i> for incoming light will be due primarily to any effects of anharmonicity within the ordered lattice. Light <a href="/wiki/Transmission_coefficient#Optics" title="Transmission coefficient">transmission</a> will be highly <a href="/wiki/Direction_(geometry)" title="Direction (geometry)">directional</a> due to the typical <a href="/wiki/Anisotropy" title="Anisotropy">anisotropy</a> of crystalline substances, which includes their <a href="/wiki/Symmetry_group" title="Symmetry group">symmetry group</a> and <a href="/wiki/Bravais_lattice" title="Bravais lattice">Bravais lattice</a>. For example, the seven different <a href="/wiki/Crystalline" class="mw-redirect" title="Crystalline">crystalline</a> forms of <a href="/wiki/Quartz" title="Quartz">quartz</a> silica (<a href="/wiki/Silicon_dioxide" title="Silicon dioxide">silicon dioxide</a>, SiO<sub>2</sub>) are all clear, <a href="/wiki/Transparent_materials" class="mw-redirect" title="Transparent materials">transparent materials</a>.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Optical_waveguides">Optical waveguides</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Transparency_and_translucency&action=edit&section=8" title="Edit section: Optical waveguides"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Optical_fiber" title="Optical fiber">Optical fiber</a></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Optical-fibre.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/46/Optical-fibre.svg/220px-Optical-fibre.svg.png" decoding="async" width="220" height="102" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/46/Optical-fibre.svg/330px-Optical-fibre.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/46/Optical-fibre.svg/440px-Optical-fibre.svg.png 2x" data-file-width="550" data-file-height="255" /></a><figcaption>Propagation of light through a multimode optical fiber</figcaption></figure> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Laser_in_fibre.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b0/Laser_in_fibre.jpg/220px-Laser_in_fibre.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b0/Laser_in_fibre.jpg/330px-Laser_in_fibre.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b0/Laser_in_fibre.jpg/440px-Laser_in_fibre.jpg 2x" data-file-width="2560" data-file-height="1920" /></a><figcaption>A laser beam bouncing down an <a href="/wiki/Acrylic_glass" class="mw-redirect" title="Acrylic glass">acrylic</a> rod, illustrating the total internal reflection of light in a multimode optical fiber</figcaption></figure> <p>Optically transparent materials focus on the response of a material to incoming light waves of a range of wavelengths. Guided light wave transmission via frequency selective waveguides involves the emerging field of <a href="/wiki/Fiber_optics" class="mw-redirect" title="Fiber optics">fiber optics</a> and the ability of certain glassy compositions to act as a <a href="/wiki/Optical_medium" title="Optical medium">transmission medium</a> for a range of frequencies simultaneously (<a href="/wiki/Multi-mode_optical_fiber" title="Multi-mode optical fiber">multi-mode optical fiber</a>) with little or no <a href="/wiki/Adjacent-channel_interference" title="Adjacent-channel interference">interference</a> between competing wavelengths or frequencies. This resonant mode of energy and data transmission via electromagnetic (light) wave propagation is relatively lossless.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (April 2021)">citation needed</span></a></i>]</sup> </p><p>An optical fiber is a <a href="/wiki/Cylindrical" class="mw-redirect" title="Cylindrical">cylindrical</a> dielectric waveguide that transmits light along its axis by the process of <a href="/wiki/Total_internal_reflection" title="Total internal reflection">total internal reflection</a>. The fiber consists of a <a href="/wiki/Core_(optical_fiber)" title="Core (optical fiber)">core</a> surrounded by a <a href="/wiki/Cladding_(fiber_optics)" title="Cladding (fiber optics)">cladding</a> layer. To confine the optical signal in the core, the <a href="/wiki/Refractive_index" title="Refractive index">refractive index</a> of the core must be greater than that of the cladding. The refractive index is the parameter reflecting the <a href="/wiki/Speed_of_light" title="Speed of light">speed of light</a> in a material. (Refractive index is the ratio of the speed of light in vacuum to the speed of light in a given medium. The refractive index of vacuum is therefore 1.) The larger the refractive index, the more slowly light travels in that medium. Typical values for core and cladding of an optical fiber are 1.48 and 1.46, respectively.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (April 2021)">citation needed</span></a></i>]</sup> </p><p>When light traveling in a dense medium hits a boundary at a steep angle, the light will be completely reflected. This effect, called <a href="/wiki/Total_internal_reflection" title="Total internal reflection">total internal reflection</a>, is used in optical fibers to confine light in the core. Light travels along the fiber bouncing back and forth off of the boundary. Because the light must strike the boundary with an angle greater than the <a href="/wiki/Total_internal_reflection" title="Total internal reflection">critical angle</a>, only light that enters the fiber within a certain range of angles will be propagated. This range of angles is called the <a href="/wiki/Acceptance_cone" class="mw-redirect" title="Acceptance cone">acceptance cone</a> of the fiber. The size of this acceptance cone is a function of the refractive index difference between the fiber's core and cladding. <a href="/wiki/Optical" class="mw-redirect" title="Optical">Optical</a> <a href="/wiki/Waveguides" class="mw-redirect" title="Waveguides">waveguides</a> are used as components in integrated optical circuits (e.g., combined with lasers or <a href="/wiki/Light-emitting_diodes" class="mw-redirect" title="Light-emitting diodes">light-emitting diodes</a>, LEDs) or as the transmission medium in local and long-haul <a href="/wiki/Optical_communication" title="Optical communication">optical communication</a> systems.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (April 2021)">citation needed</span></a></i>]</sup> </p> <div class="mw-heading mw-heading3"><h3 id="Mechanisms_of_attenuation">Mechanisms of attenuation</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Transparency_and_translucency&action=edit&section=9" title="Edit section: Mechanisms of attenuation"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Silica_core_fiber_minimum_attenuation.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3c/Silica_core_fiber_minimum_attenuation.jpg/260px-Silica_core_fiber_minimum_attenuation.jpg" decoding="async" width="260" height="199" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3c/Silica_core_fiber_minimum_attenuation.jpg/390px-Silica_core_fiber_minimum_attenuation.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3c/Silica_core_fiber_minimum_attenuation.jpg/520px-Silica_core_fiber_minimum_attenuation.jpg 2x" data-file-width="917" data-file-height="702" /></a><figcaption>Experimentally measured record low attenuation of silica core optical fiber. At 1,550 nm, wavelength attenuation components are determined as follows: Rayleigh scattering loss ~ 0.1200 dB/km, infrared absorption loss ~ 0.0150 dB/km, impurity absorption loss ~ 0.0047 dB/km, waveguide imperfection loss ~ 0.0010 dB/km.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup></figcaption></figure> <p><a href="/wiki/Attenuation" title="Attenuation">Attenuation</a> in <a href="/wiki/Optical_fiber" title="Optical fiber">fiber optics</a>, also known as <i>transmission loss</i>, is the reduction in intensity of the light beam (or signal) with respect to distance traveled through a transmission medium. It is an important factor limiting the transmission of a signal across large distances. <a href="/wiki/Attenuation_coefficient" title="Attenuation coefficient">Attenuation coefficients</a> in fiber optics usually use units of dB/km through the medium due to the very high quality of transparency of modern optical transmission media. The medium is usually a fiber of <a href="/wiki/Silica_glass" class="mw-redirect" title="Silica glass">silica glass</a> that confines the incident light beam to the inside. </p><p>In optical fibers, the main source of attenuation is <a href="/wiki/Scattering" title="Scattering">scattering</a> from molecular level irregularities, called <a href="/wiki/Rayleigh_scattering" title="Rayleigh scattering">Rayleigh scattering</a>,<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> due to structural disorder and compositional fluctuations of the <a href="/wiki/Amorphous_solid" title="Amorphous solid">glass structure</a>. This same phenomenon is seen as one of the limiting factors in the transparency of infrared missile domes.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> Further attenuation is caused by light absorbed by residual materials, such as metals or water ions, within the fiber core and inner cladding. Light leakage due to bending, splices, connectors, or other outside forces are other factors resulting in attenuation. At high optical powers, scattering can also be caused by nonlinear optical processes in the fiber.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="As_camouflage">As camouflage</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Transparency_and_translucency&action=edit&section=10" title="Edit section: As camouflage"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Expl0469_-_Flickr_-_NOAA_Photo_Library.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0a/Expl0469_-_Flickr_-_NOAA_Photo_Library.jpg/170px-Expl0469_-_Flickr_-_NOAA_Photo_Library.jpg" decoding="async" width="170" height="227" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0a/Expl0469_-_Flickr_-_NOAA_Photo_Library.jpg/255px-Expl0469_-_Flickr_-_NOAA_Photo_Library.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/0a/Expl0469_-_Flickr_-_NOAA_Photo_Library.jpg/340px-Expl0469_-_Flickr_-_NOAA_Photo_Library.jpg 2x" data-file-width="1792" data-file-height="2388" /></a><figcaption>Many animals of the open sea, like this <i><a href="/wiki/Aurelia_labiata" title="Aurelia labiata">Aurelia labiata</a></i> jellyfish, are largely transparent.</figcaption></figure> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/List_of_camouflage_methods" title="List of camouflage methods">List of camouflage methods</a></div> <p>Many <a href="/wiki/Sea" title="Sea">marine</a> animals that float near the surface are highly transparent, giving them almost perfect <a href="/wiki/Camouflage" title="Camouflage">camouflage</a>.<sup id="cite_ref-HerringTransparency_18-0" class="reference"><a href="#cite_note-HerringTransparency-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> However, transparency is difficult for bodies made of materials that have different <a href="/wiki/Refractive_index" title="Refractive index">refractive indices</a> from seawater. Some marine animals such as <a href="/wiki/Jellyfish" title="Jellyfish">jellyfish</a> have gelatinous bodies, composed mainly of water; their thick <a href="/wiki/Mesoglea" title="Mesoglea">mesogloea</a> is acellular and highly transparent. This conveniently makes them <a href="/wiki/Buoyancy" title="Buoyancy">buoyant</a>, but it also makes them large for their muscle mass, so they cannot swim fast, making this form of camouflage a costly trade-off with mobility.<sup id="cite_ref-HerringTransparency_18-1" class="reference"><a href="#cite_note-HerringTransparency-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> Gelatinous <a href="/wiki/Plankton" title="Plankton">planktonic</a> animals are between 50 and 90 percent transparent. A transparency of 50 percent is enough to make an animal invisible to a predator such as <a href="/wiki/Cod" title="Cod">cod</a> at a depth of 650 metres (2,130 ft); better transparency is required for <a href="/wiki/Invisibility" title="Invisibility">invisibility</a> in shallower water, where the light is brighter and predators can see better. For example, a cod can see prey that are 98 percent transparent in optimal lighting in shallow water. Therefore, sufficient transparency for camouflage is more easily achieved in deeper waters.<sup id="cite_ref-HerringTransparency_18-2" class="reference"><a href="#cite_note-HerringTransparency-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> For the same reason, transparency in air is even harder to achieve, but a partial example is found in the <a href="/wiki/Glass_frog" title="Glass frog">glass frogs</a> of the South American rain forest, which have translucent skin and pale greenish limbs.<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> Several Central American species of clearwing (<a href="/wiki/Ithomiini" title="Ithomiini">ithomiine</a>) butterflies and many <a href="/wiki/Dragonfly" title="Dragonfly">dragonflies</a> and allied <a href="/wiki/Insect" title="Insect">insects</a> also have wings which are mostly transparent, a form of <a href="/wiki/Crypsis" title="Crypsis">crypsis</a> that provides some protection from predators.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (April 2021)">citation needed</span></a></i>]</sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Transparency_and_translucency&action=edit&section=11" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1184024115">.mw-parser-output .div-col{margin-top:0.3em;column-width:30em}.mw-parser-output .div-col-small{font-size:90%}.mw-parser-output .div-col-rules{column-rule:1px solid #aaa}.mw-parser-output .div-col dl,.mw-parser-output .div-col ol,.mw-parser-output .div-col ul{margin-top:0}.mw-parser-output .div-col li,.mw-parser-output .div-col dd{page-break-inside:avoid;break-inside:avoid-column}</style><div class="div-col" style="column-width: 22em;"> <ul><li><a href="/wiki/Brillouin_scattering" title="Brillouin scattering">Brillouin scattering</a></li> <li><a href="/wiki/Clarity_meter" class="mw-redirect" title="Clarity meter">Clarity meter</a></li> <li><a href="/wiki/Colloidal_crystal" title="Colloidal crystal">Colloidal crystal</a></li> <li><a href="/wiki/Haze_(optics)" title="Haze (optics)">Haze (optics)</a></li> <li><a href="/wiki/Light_scattering" class="mw-redirect" title="Light scattering">Light scattering</a></li> <li><a href="/wiki/Pellicle_mirror" title="Pellicle mirror">Pellicle mirror</a></li> <li><a href="/wiki/Photonic_crystal" title="Photonic crystal">Photonic crystal</a></li> <li><a href="/wiki/Transparent_metals" class="mw-redirect" title="Transparent metals">Transparent metals</a></li> <li><a href="/wiki/Turbidity" title="Turbidity">Turbidity</a></li></ul> </div> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Transparency_and_translucency&action=edit&section=12" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.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 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a{background: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:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.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}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFThomas1999" class="citation journal cs1">Thomas, S. 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Opt</i>. <b>11</b> (11): 2489–94. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1972ApOpt..11.2489S">1972ApOpt..11.2489S</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1364%2FAO.11.002489">10.1364/AO.11.002489</a>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/20119362">20119362</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Appl.+Opt.&rft.atitle=Optical+power+handling+capacity+of+low+loss+optical+fibers+as+determined+by+stimulated+Raman+and+Brillouin+scattering&rft.volume=11&rft.issue=11&rft.pages=2489-94&rft.date=1972&rft_id=info%3Apmid%2F20119362&rft_id=info%3Adoi%2F10.1364%2FAO.11.002489&rft_id=info%3Abibcode%2F1972ApOpt..11.2489S&rft.au=Smith%2C+R.G.&rfr_id=info%3Asid%2Fen.wikipedia.org%3ATransparency+and+translucency" class="Z3988"></span></span> </li> <li id="cite_note-HerringTransparency-18"><span class="mw-cite-backlink">^ <a href="#cite_ref-HerringTransparency_18-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-HerringTransparency_18-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-HerringTransparency_18-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text">Herring, Peter (2002). <i>The Biology of the Deep Ocean</i>. Oxford University Press. <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-19-854956-7" title="Special:BookSources/978-0-19-854956-7">978-0-19-854956-7</a>. pp. 190–191.</span> </li> <li id="cite_note-19"><span class="mw-cite-backlink"><b><a href="#cite_ref-19">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFNaish" class="citation web cs1">Naish, D. <a rel="nofollow" class="external text" href="http://scienceblogs.com/tetrapodzoology/2007/11/09/green-boned-glass-frogs/">"Green-boned glass frogs, monkey frogs, toothless toads"</a>. <i>Tetrapod zoology</i>. scienceblogs.com. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20121111125205/http://scienceblogs.com/tetrapodzoology/2007/11/09/green-boned-glass-frogs/">Archived</a> from the original on 11 November 2012<span class="reference-accessdate">. Retrieved <span class="nowrap">14 February</span> 2013</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Tetrapod+zoology&rft.atitle=Green-boned+glass+frogs%2C+monkey+frogs%2C+toothless+toads&rft.aulast=Naish&rft.aufirst=D.&rft_id=http%3A%2F%2Fscienceblogs.com%2Ftetrapodzoology%2F2007%2F11%2F09%2Fgreen-boned-glass-frogs%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3ATransparency+and+translucency" class="Z3988"></span></span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="Further_reading">Further reading</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Transparency_and_translucency&action=edit&section=13" title="Edit section: Further reading"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><i>Electrodynamics of continuous media</i>, Landau, L. D., Lifshits. E.M. and Pitaevskii, L.P., (Pergamon Press, Oxford, 1984)</li> <li><i>Laser Light Scattering: Basic Principles and Practice</i> Chu, B., 2nd Edn. (Academic Press, New York 1992)</li> <li><i>Solid State Laser Engineering</i>, W. Koechner (Springer-Verlag, New York, 1999)</li> <li><i>Introduction to Chemical Physics</i>, J.C. Slater (McGraw-Hill, New York, 1939)</li> <li><i>Modern Theory of Solids</i>, F. Seitz, (McGraw-Hill, New York, 1940)</li> <li><i>Modern Aspects of the Vitreous State</i>, J.D.MacKenzie, Ed. (Butterworths, London, 1960)</li></ul> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Transparency_and_translucency&action=edit&section=14" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output 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glass</a></li> <li><a href="/wiki/Borosilicate_glass" title="Borosilicate glass">Borosilicate glass</a></li> <li><a href="/wiki/Ceramic_glaze" title="Ceramic glaze">Ceramic glaze</a></li> <li><a href="/wiki/Chalcogenide_glass" title="Chalcogenide glass">Chalcogenide glass</a></li> <li><a href="/wiki/Cobalt_glass" title="Cobalt glass">Cobalt glass</a></li> <li><a href="/wiki/Cranberry_glass" title="Cranberry glass">Cranberry glass</a></li> <li><a href="/wiki/Crown_glass_(optics)" title="Crown glass (optics)">Crown glass</a></li> <li><a href="/wiki/Flint_glass" title="Flint glass">Flint glass</a></li> <li><a href="/wiki/Fluorosilicate_glass" title="Fluorosilicate glass">Fluorosilicate glass</a></li> <li><a href="/wiki/Fused_quartz" title="Fused quartz">Fused quartz</a></li> <li><a href="/wiki/GeSbTe" title="GeSbTe">GeSbTe</a></li> <li><a href="/wiki/Cranberry_glass" title="Cranberry glass">Gold ruby glass</a></li> <li><a href="/wiki/Lead_glass" title="Lead glass">Lead glass</a></li> <li><a href="/wiki/Milk_glass" title="Milk glass">Milk glass</a></li> <li><a href="/wiki/Phosphosilicate_glass" title="Phosphosilicate glass">Phosphosilicate glass</a></li> <li><a href="/wiki/Photochromic_lens" title="Photochromic lens">Photochromic lens glass</a></li> <li><a href="/wiki/Glass#Silicate_glass" title="Glass">Silicate glass</a></li> <li><a href="/wiki/Soda%E2%80%93lime_glass" title="Soda–lime glass">Soda–lime glass</a></li> <li><a href="/wiki/Sodium_hexametaphosphate" title="Sodium hexametaphosphate">Sodium hexametaphosphate</a></li> <li><a href="/wiki/Sodium_silicate" title="Sodium silicate">Soluble glass</a></li> <li><a href="/wiki/Tellurite_glass" title="Tellurite glass">Tellurite glass</a></li> <li><a href="/wiki/Thoriated_glass" title="Thoriated glass">Thoriated glass</a></li> <li><a href="/wiki/Ultra_low_expansion_glass" title="Ultra low expansion glass">Ultra low expansion glass</a></li> <li><a href="/wiki/Uranium_glass" title="Uranium glass">Uranium glass</a></li> <li><a href="/wiki/Vitreous_enamel" title="Vitreous enamel">Vitreous enamel</a></li> <li><a href="/wiki/Wood%27s_glass" title="Wood's glass">Wood's glass</a></li> <li><a href="/wiki/ZBLAN" title="ZBLAN">ZBLAN</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Glass-ceramic" title="Glass-ceramic">Glass-ceramics</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bioactive_glass" title="Bioactive glass">Bioactive glass</a></li> <li><a href="/wiki/CorningWare" title="CorningWare">CorningWare</a></li> <li><a href="/wiki/Glass-ceramic-to-metal_seals" title="Glass-ceramic-to-metal seals">Glass-ceramic-to-metal seals</a></li> <li><a href="/wiki/Macor" title="Macor">Macor</a></li> <li><a href="/wiki/Zerodur" title="Zerodur">Zerodur</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Preparation</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Annealing_(glass)" title="Annealing (glass)">Annealing</a></li> <li><a href="/wiki/Chemical_vapor_deposition" title="Chemical vapor deposition">Chemical vapor deposition</a></li> <li><a href="/wiki/Glass_batch_calculation" title="Glass batch calculation">Glass batch calculation</a></li> <li><a href="/wiki/Glass_production" title="Glass production">Glass forming</a></li> <li><a href="/wiki/Glass_production#Hot_end" title="Glass production">Glass melting</a></li> <li><a href="/wiki/Calculation_of_glass_properties" title="Calculation of glass properties">Glass modeling</a></li> <li><a href="/wiki/Ion_implantation" title="Ion implantation">Ion implantation</a></li> <li><a href="/wiki/Liquidus" class="mw-redirect" title="Liquidus">Liquidus temperature</a></li> <li><a href="/wiki/Sol%E2%80%93gel_process" title="Sol–gel process">sol–gel technique</a></li> <li><a href="/wiki/Viscosity#Viscosity_of_amorphous_materials" title="Viscosity">Viscosity</a></li> <li><a href="/wiki/Vitrification" title="Vitrification">Vitrification</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Optics" title="Optics">Optics</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Achromatic_lens" title="Achromatic lens">Achromat</a></li> <li><a href="/wiki/Dispersion_(optics)" title="Dispersion (optics)">Dispersion</a></li> <li><a href="/wiki/Gradient-index_optics" title="Gradient-index optics">Gradient-index optics</a></li> <li><a href="/wiki/Hydrogen_darkening" title="Hydrogen darkening">Hydrogen darkening</a></li> <li><a href="/wiki/Optical_amplifier" title="Optical amplifier">Optical amplifier</a></li> <li><a href="/wiki/Optical_fiber" title="Optical fiber">Optical fiber</a></li> <li><a href="/wiki/Optical_lens_design" title="Optical lens design">Optical lens design</a></li> <li><a href="/wiki/Photochromic_lens" title="Photochromic lens">Photochromic lens</a></li> <li><a href="/wiki/Photosensitive_glass" title="Photosensitive glass">Photosensitive glass</a></li> <li><a href="/wiki/Refraction" title="Refraction">Refraction</a></li> <li><a class="mw-selflink selflink">Transparent materials</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Surface<br />modification</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Anti-reflective_coating" title="Anti-reflective coating">Anti-reflective coating</a></li> <li><a href="/wiki/Chemically_strengthened_glass" title="Chemically strengthened glass">Chemically strengthened glass</a></li> <li><a href="/wiki/Corrosion#Corrosion_of_glasses" title="Corrosion">Corrosion</a></li> <li><a href="/wiki/Dealkalization" title="Dealkalization">Dealkalization</a></li> <li><a href="/wiki/DNA_microarray" title="DNA microarray">DNA microarray</a></li> <li><a href="/wiki/Hydrogen_darkening" title="Hydrogen darkening">Hydrogen darkening</a></li> <li><a href="/wiki/Insulated_glazing" title="Insulated glazing">Insulated glazing</a></li> <li><a href="/wiki/Porous_glass" title="Porous glass">Porous glass</a></li> <li><a href="/wiki/Self-cleaning_glass" title="Self-cleaning glass">Self-cleaning glass</a></li> <li><a href="/wiki/Sol%E2%80%93gel_process" title="Sol–gel process">sol–gel technique</a></li> <li><a href="/wiki/Tempered_glass" title="Tempered glass">Tempered glass</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Diverse<br />topics</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Conservation_and_restoration_of_glass_objects" title="Conservation and restoration of glass objects">Conservation and restoration of glass objects</a></li> <li><a href="/wiki/Glass-coated_wire" title="Glass-coated wire">Glass-coated wire</a></li> <li><a href="/wiki/Safety_glass" title="Safety glass">Safety glass</a></li> <li><a href="/wiki/Glass_databases" title="Glass databases">Glass databases</a></li> <li><a href="/wiki/Glass_electrode" title="Glass electrode">Glass electrode</a></li> <li><a href="/wiki/Glass_fiber_reinforced_concrete" title="Glass fiber reinforced concrete">Glass fiber reinforced concrete</a></li> <li><a href="/wiki/Glass_ionomer_cement" title="Glass ionomer cement">Glass ionomer cement</a></li> <li><a href="/wiki/Glass_microsphere" title="Glass microsphere">Glass microspheres</a></li> <li><a href="/wiki/Fiberglass" title="Fiberglass">Glass-reinforced plastic</a></li> <li><a href="/wiki/Glass_cloth" title="Glass cloth">Glass cloth</a></li> <li><a href="/wiki/Glass-to-metal_seal" title="Glass-to-metal seal">Glass-to-metal seal</a></li> <li><a href="/wiki/Porous_glass" title="Porous glass">Porous glass</a></li> <li><a href="/wiki/Pre-preg" title="Pre-preg">Pre-preg</a></li> <li><a href="/wiki/Prince_Rupert%27s_drop" title="Prince Rupert's drop">Prince Rupert's drops</a></li> <li><a href="/wiki/Radioactive_waste#Vitrification" title="Radioactive waste">Radioactive waste vitrification</a></li> <li><a href="/wiki/Windshield" title="Windshield">Windshield</a></li> <li><a href="/wiki/Glass_fiber" title="Glass fiber">Glass fiber</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"><style data-mw-deduplicate="TemplateStyles:r1038841319">.mw-parser-output .tooltip-dotted{border-bottom:1px dotted;cursor:help}</style></div><div role="navigation" class="navbox authority-control" aria-label="Navbox" 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