Question

What is meant by power of lens what is it's SI unit?

Answer 1

Answer:

Power of lens is defined as the reciprocal of the focal length of the lens expressed in meter. SI unit of power is Dioptre denoted by D. Focal length of first lens f1=40 cm=0. 4 m. Since the focal length is positive, so it is a convex lens.

Explanation:

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Answer 2

Answer:

The power of a lens is defined as the reciprocal of its focal length. It is represented by P. The power of a lens is related to focal length as below, Power of a lens = 1/Focal Length in meters.

si unit of power is diopter