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I have to be like 2 meters away from the LED to focus the LED light with a fresnel lens. Why is that? You are building an imaging system that images the LED onto another plane: http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/lensdet.html The distance you need to be away from the LED depends on the focal length of your lens and the distance from the lens ...


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