Question

If the lens power of glass is +2 diopter, its focal length will be

Answer 1

its focal length will be 0.5 m

Answer 2

Power of lens, P = +2 D

Local length = f

We know that P = 1/f

Or f = 1/P

Or f = 1/2 = +0.5 m

Local length of lens is +0.5 m