Question

Define power of a lens .How is it related to the focal length of the lens?​

Answer 1

Answer:

Power of lens is defined as the reciprocal of the focal length of the lens expressed in meter. SI unit of power is Dioptre denoted by D. Since the focal length is positive, so it is a convex lens. Since the focal length is negative, so it is a concave lens

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Answer 2

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