what the means of 1 diopter
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The power of lens is said to be 1D if its focal length is 1 metre.
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A dioptre (British spelling) or diopter (Amer- ican 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)
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