Question

find the focal length of a lens of power - 2.0 D. what type of lens is this?​

Answer 1

Answer:

P = 1/f

-2 = 1/f

f = -1/2

Since the focal length of a convex lens cannot be negative. The lens used here is a concave lens.

Answer 2

Answer:

Concave lens.

Explanation.

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