Question

iii)   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
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Answer 1

Answer:

Explanation:

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

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

So, power of the lens = 1 / f

P = 1 / 0.25  

P = 4 D

Since power of a lens is positive which shows that, the lens is a converging lens.

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