define 1 dioptre of power of lens
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1 dioptre is the power of lens whose focal length is 1 metre.
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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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