1.

What is the S I unit of power of lens ? ​

Answer»

ANSWER:

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.) It is thus a unit of reciprocal length.



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