Question

Define 1 dioptre of a power lens.​

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.) It is thus a unit of reciprocal length.

Answer 2

Answer:

1 dioptre is SI unit of the power of a lens whose focal length is 1 metre. It is denoted by the letter D . thus 1 d = 1 m inverse