Question

define power of lens and write their unit​

Answer 1

Answer:

Power of a lens is the ability to converge or diverge the ray of light falling on it. Power of a lens is defined as reciprocal of focal length of the lens.The SI unit of the power is diopter.

Answer 2

Explanation:

Power of lens is known as the inverse of the focal length of the lens measured in meter(m). S.I unit of power = Dioptre (D) Power of lense = 1/ focal length in meter.