Question

find the power of a convex lens of focal length 2m.

Answer 1

Power = 1/Focal Length
= 1/(2 m)
= 0.5 Diopter

Power of lense is 0.5 Diopter

Answer 2

HI !

Focal length = f = 2 m

Power = 1/f
           = 1/2
           = 0.5 D

Power of the lens is 0.5 D