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Unilorin Post-UTME Physics 2023 (Model questions) Question 7

Question 7

Lenses and Optical Instruments

A converging lens has a radius of curvature 16.0cm, calculate the power of the lens

  1. A.6.25D
  2. B.12.5D
  3. C.25.0D
  4. D.5.0D
Show the answer and explanation

Answer: B (12.5D)

Explanation

f = r/2 = 8 cm = 0.08 m. Power = 1/f = 1 ÷ 0.08 = 12.5 D.