Question

define 1 dioptre of power of lens.....​

Answer 1

Answer:

The measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres.

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Answer 2

Answer:

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.