define one dioptre ?
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When focal length of a lens is 1m, then the power of the lens is 1 dioptre.
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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.
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