Question

The power of lens is-2D. Calculate its focal length​

Answer 1

Answer:

0.5cm

Explanation:

P=1/f

2D=1/f

f=1/2

f=0.5

Answer 2

Explanation:

Power of lens = 1/f where f is the focal length.

-2 = 1/f

f = -0.5 m

Since the focal length is negative, it is a concave lens.