Pautan luar Kanta Fresnel

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Templat:Lighthouses

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WikiPedia: Kanta Fresnel http://www.bbc.com/travel/story/20190620-the-inven... http://www.bhlens.com/image/linearfresnel.gif http://search.eb.com/eb/article-9016395 http://search.eb.com/eb/article-9035385 http://www.lighthousefriends.com/light.asp?ID=141 http://lighthousegetaway.com/lights/fresnel.html http://www.merriam-webster.com/dictionary/fresnel%... http://www.michiganlights.com/fresnel.htm http://www.nikon.com/news/2015/0106_lens_02.htm http://www.soitec.com/en/technologies/concentrix/