what is lens? in class 7 please correct answer
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Answer:A Lens is a type of mirror which refracts the light instead of reflection. Refraction is the bending of a light when it enters a medium.
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A lens is a piece of transparent material, usually circular in shape, with two polished surfaces, either or both of which is curved and may be either convex (bulging) or concave (depressed). The curves are almost always spherical; i.e., the radius of curvature is constant.
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