Question

What will be the power of a convex lens whose distance from focus is 25 cm ?

Answer 1

Answer:

P = + 4 D. Since it is a positive focal length, the lens will be a convex lens or a converging lens and the power is written as '+'.

Hope it will help you.

Answer 2

Answer:

distance from focus = focal length = 25cm

Explanation:

Therefore power of lens= 1/focal length

power of lens= 1/25

power of lens= +0.0.4

(since it is convex lens)