Question

The power of a lens is + 2.5 D.What is it's focal length?
(Please give full solution)​

Answer 1

Answer:

we know that power P=2.5D

P= 1/f

f= 1/2.5=0.4m=40cm

Since the focal length of lens is positive so it is a convex lens. It is a converging lens.

Explanation:

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