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What is the SI unit for the power of lens?

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What is the SI unit for the power of lens?
posted Sep 21, 2018 by anonymous

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Dioptre/Diopter

A dioptre or diopter 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 Sep 21, 2018 by Salil Agrawal
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