Question

Find the power of concave lens whose focal length is 2 cm

Answer 1

Answer:

Power of al lens = 1/f D

and in question f (focal length) = 2cm

Therefore power of concave lens whose focal length is 2 cm = 1/f

= 1/2

= - 0.5 Dioptre.

Answer 2

Explanation:

p=1/f

p=100/2(since unit is cm)

p=50 dioptre

the question u have given might be wrong because lens of this power is not possible