What is the power of lens

1.	What is the power of lens
Answer» \tThe power of a lens is defined as the reciprocal of its focal length.\tIt is represented by the letter P.\tP = 1/f\tThe SI unit of power of a lens is ‘dioptre’. It is denoted by the letter D.\tPower of a convex lens is positive and that of a concave lens is negative.

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