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What is a Fresnel lens and how does it work? - Quora
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What is a Fresnel lens? Why were they used on lighthouses? Are there any alternatives to using a Fresnel lens? - Quora
Category:Fresnel solar cooker designs, Solar Cooking
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Hilbert Book Model Project/Stochastic Location Generators/de - Wikiversity
Kinoform Lenses Modern Magnetic Systems - Max Planck Institute for Intelligent Systems
What is a Fresnel lens and how does it work? - Quora
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Linse (Optik) – Wikipedia