Question

Find the power of concave lenses of focal length 2m

Answer 1

The focal length is given concave lens is 2 m power of lens p = 1/f.
P = 1 / -2 ( v shd always take it negative)
P = -0.5 D

Answer 2

power of the lens

p=1/f

p=1/-2

p= -.5 dioptre