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WAEC Physics 2022 Objective — Question 16

Question 16 of 50 from the West African Examinations Council (WAEC) Physics 2022 Objective paper, with the correct answer and a full explanation.

The power of a lens is +2.5 D. What is its radius of curvature?

A. 2.5 cm
B. 25.0 cm
C. 40.0 cm
D. 80.0 cmCorrect

Explanation

Power P=1/f, so f=1/2.5=0.4m=40cm. Radius of curvature R=2f=2×40=80cm.

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