Question

Name the type of the lens is -2.D . Find the focal length of this lens​

Answer 1

Answer:

The type of the lens is concave lens and the focal length is -0.5m.

Answer 2

Given,

Power of the lens, P = -2.0 D

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

focal length =

P = 1 / f

-0.2 = 1/ f

- 10 / 2 = f

f = -0.5 cm