What is the power of lens? Write SI unit of power of lense and write the Equestion showing relation between power of lense and focal length
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The power of lens defined as the reciprocal of the focal length. S . I . unit of power of lense is dioptre. powerful converging lens will focus parallel light rays closer to itself and we'll have a smaller focal length then weak lens . The power of a lens is P = 1f
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