Question

The power of a convex lens of focal length 25 cm is .

(A) +4.0 D (B) 0.25 D (C) -4.0 D (D) - 0.4 D​

Answer 1

Answer:

(a) + 4.0 D

Explanation:

Power of the lens is always the reciprocal of the focal length of the lens

Focal length of the lens = f= 25 cm= 0.25m

So, Power of the lens = 1/f

p= 1/0.25

p=4D

I hope it will help you