Question

Define 1 dioptre of power of a lens.
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Answer 1

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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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Answer 2

Answer:

Explanation:

but i m not sure  (1 dioptre = 1 m−1.) ... For example, a 3-dioptre lens brings parallel rays of light to focus at ​1⁄3 metre.