Q. A convex lens has a focal length of 20 cm. Its power is:

  • (A) +2 D
  • (B) +5 D
  • (C) -5 D
  • (D) +10 D
✅ Correct Answer: (B) +5 D
Explanation: Power P = 1/f (in meters) = 1/0.2 = +5 diopters.

Published by Jyoti ⭐ 1.79K Points at 15-Jun-2026 06:05 am in Physics

Explanation by: Jyoti
Power P = 1/f (in meters) = 1/0.2 = +5 diopters.

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