what is the si unit of power of lens?
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a dioptre is the si unit of power of lens
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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.) It is thus a unit of reciprocal length. Dioptre is the SI unit of power of lens...
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