Question

the unity of power of lens is​

Answer 1

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Dioptre is the unit of power of lens...

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Answer 2

The unity of power of lens is dioptre

A dioptre (British spelling) or diopter (American spelling) is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres. (1 dioptre = 1 m−1.) It is thus a unit of reciprocal length.