Question

Define one dioptre?​

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.

Explanation:

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Answer 2

Answer:

one diopter which is equal to the reciprocal of the focal length measured in the meters (1diopter=1m-1)