Fresnel lenses
December 26th, 2009
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Carry compact magnifying lens with cell phone. If the steps are narrow, the surface of each step is generally made conical magnifying lamp and not spherical. Fresnel lenses resemble a planoconvex or planoconcave lens that is cut into narrow rings and flattened. There are two types of adjustability: fixed focal length and variable focal length. For convenience we assume that the optical center of the lens to the image sensor plane.
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