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Baris 167:
* {{cite web|url=http://www.terrypepper.com/lights/index.htm |author=Pepper, Terry|title=''Seeing the Light: Lighthouses on the western Great Lakes''}}
* [http://www-personal.umich.edu/~bclee/lens.html Random Destructive Acts via Focused Solar Radiation.]
* [http://www.truckview.net TruckView Fresnel lens combats the HGV Blind-Spot.] {{Webarchive|url=https://web.archive.org/web/20190408105246/http://www.truckview.net/ |date=2019-04-08 }}
* [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 }}
Baris 175:
* [http://books.google.com/books?id=KdYclkhSfTAC&pg=PT49&lpg=PT49&dq=optical+glass+ingredients&source=web&ots=sLEkmvi05g&sig=F6ERFbklTewIvFuKh30POTb0JG0&hl=en&sa=X&oi=book_result&resnum=7&ct=result Optical glass construction]
* [http://www.bbc.co.uk/radio4/history/inourtime/inourtime_20070301.shtml History of Optics (audio mp3)] {{Webarchive|url=https://web.archive.org/web/20090106072032/http://www.bbc.co.uk/radio4/history/inourtime/inourtime_20070301.shtml |date=2009-01-06 }} by Simon Schaffer, Professor in History and Philosophy of Science at the [[University of Cambridge]], Jim Bennett, Director of the Museum of the History of Science at the [[University of Oxford]] and Emily Winterburn, Curator of Astronomy at the [[National Maritime Museum]] (recorded by the [[BBC]]).
* [http://www.lightandmatter.com/html_books/5op/ch04/ch04.html a chapter from an online textbook on refraction and lenses] {{Webarchive|url=https://web.archive.org/web/20091217113846/http://www.lightandmatter.com/html_books/5op/ch04/ch04.html |date=2009-12-17 }}
* [http://www.physnet.org/modules/pdfmodules/m223.pdf ''Thin Spherical Lenses ''] on [http://www.physnet.org Project PHYSNET].
* [http://www.digitalartform.com/lenses.htm Lens article at ''digitalartform.com''] {{Webarchive|url=https://web.archive.org/web/20160304054022/http://www.digitalartform.com/lenses.htm |date=2016-03-04 }}
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