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Fresnel lens - Wikipedia
Hybrid fresnel lenses - Official Wasteland 3 Wiki
Huygens–Fresnel principle - Wikiwand
File:Refraction on an aperture - Huygens-Fresnel principle.svg - Wikimedia Commons
Fresnel zone - Wikipedia
Fresnel lens - Wikipedia
First Fresnel zone, calculation of the parameters in... | Download Scientific Diagram
Fresnel lens - Wiktionary
Google Image Result for http://upload.wikimedia.org/wikipedia/commons/0/0f/1st_order_Fresnel_light… | Lighthouse lighting, Lighthouse pictures, Beautiful lighthouse