Find the power of a concave lens of focal length `2 m`.

Explanation

Focal length of concave lens, f = 2m
Power of a lens, `P = (1)/("f(in meters)")`
`=(1)/(-2)= -0.5 D`
Here, negative sign arises due to the divergent nature of concave lens. Hence, the power of the given concave lens is D.