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​

Answer 1

Explanation:

Answer is A

Power = 1/f

f = 25

Convex lens positive

100 /25 =4D