Q. Diopter is unit of _____.
Answer: Power of lens
Notes: A diopter is the unit of measurement of the optical power of a lens or a curved mirror. In terms of numerical value, it is equal to the reciprocal of the focal length of a lens of a curved mirror measured in meters. In other words, a diopter is the unit of reciprocal length. The power of a lens to change the convergence of light is called its optical power.

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