Question

Find the power of a convex lens of focal length of + 25 cm.

Answer 1

Given: Focal length (f) = 25 cm = 0.25 m

To find: Power of the lens (P)

Formula: P = `1/("f"("m"))`

Calculation: From formula, P = `1/0.25` = 4 D

The power of the convex lens is 4 D.