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Define Power of a Lens and state its S.I. unit.
Define Power of a Lens and state its S.I. unit.
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Power of a lens is the reciprocal of its focal length: \(P = \frac{1}{f}\).
The S.I. unit of power is {Dioptre (D)}, where \(1D = 1\,m^{-1}\).
Updated On: Mar 10, 2026
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