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Fresnel lens - Wikipedia
A Fresnel lens is a type of composite compact lens originally developed by
French physicist ... Whereas Buffon proposed grinding such a lens from a single
piece of glass, the Marquis de Condorcet (1743–1794) proposed making it with ...
In the first (and largest) Fresnel lenses, each section was actually a separate
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Rays of light entering a converging lens parallel to its axis converge at its focal
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