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Dioptere is the unit of
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- power of a lens
- focal length of a lens
- light intensity
- sound intensity
- power of a lens
Correct Option: A
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 (that is, 1/metres). It is thus a unit of reciprocal length.
