Q. The power of a lens is measured in:

A
Watt
B
Diopters
C
Decibel
D
None of these
Solution:

A dioptre (uk), or diopter (us), 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.

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