Question

Define 1 dioptre of power of a lens ?
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Answer 1

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.)

Answer 2

1 dioptre is the power of the lens whose focul length is 1 metre