Why are concave mirrors used in projectors?
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The mirror would reflect light in parallel rays if the object was at the principal focus of the mirror. However, in the slide projector the light source is placed so that the light follows the paths.They all show the same paths for the light rays.
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In a project we need a parallel beam of light which could be spread over an area using a convex lens but the job of making the light rays parallel in a beam form is done by a concave mirror.
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