Question

RAM wearing spectacles of power 2.25D . what is defect in his eyes

Answer 1

1. Power of lens = +2.5D , e.g., positive means lens is converging.
2. A converging lens is convex lens
3. Convex lens is used to correct myopia

Now, P = +2.5D

Now, P = +2.5DP = 1/f

Now, P = +2.5DP = 1/f⇒f = 1/P = 1/2.5 m = 100/2.5 = 40cm