Question

Define 1dioptre of power​

Answer 1

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Dioptre

Dioptre is a unit of measurement of optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres

Answer 2

Heya user here u go

A dioptre 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 2-dioptre lens brings parallel rays of light to focus at ​1⁄2 metre.