Question

definr one diopter of power of a lens​

Answer 1

Answer:

one diaptor is the power of a lens whose focal length is one metre

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.) ... For example, a 3-dioptre lens brings parallel rays of light to focus at 1⁄3 metre.

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