Lensa Fresnel: Perbedaan antara revisi

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* {{cite web|url=http://www.terrypepper.com/lights/index.htm |author=Pepper, Terry|title=''Seeing the Light: Lighthouses on the western Great Lakes''}}
* [http://vega.org.uk/video/programme/226 How the Fresnel lens works.]
* [http://www.digitalartform.com/archives/2009/04/fresnel_lens_-.html A computer analysis of the Fresnel lens cross section depicted in the 'graphic examples' section of this very Wikipedia article.] {{Webarchive|url=https://web.archive.org/web/20090520054046/http://www.digitalartform.com/archives/2009/04/fresnel_lens_-.html |date=2009-05-20 }}
 
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