Question

the power of lens is 2.0 D find find its focal length and what types of lens

Answer 1

P=1/f , 2=1/f ,f = 1/2,f=0.5m,f=50cm.      Convex lens

Answer 2

Explanation:

Power of lens, P= 1/f

P= -2D

f= -1/2 = -0.5 m

A concave lens has a negative focal length. Hence, it is a concave lens.