Question

define power of lens si unit of lens

Answer 1

Hey mate !!
Here's your answer ^-^

The POWER of a lens is the reciprocal of the focal length of the lens. Its SI unit is Dioptre(D).
p = 1/f

Hope this helps..☺☺

Answer 2

The ability of a lens to converge/diverge a beam of light rays is expressed in terms of its power (P). It is the inverse of focal length,f(in meters).

Hence, power of a lens is given by the relation

p=1/f

The SI unit of power is dioptre (D).