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JAMB Physics 2006 Question 38

Question 38

Refraction of Light

A submarine is observed to rise from a real depth of 80 m to 60 m in water. Calculate the change in apparent depth. [Refractive index of water = 4/3]

  1. A.60m.
  2. B.15m.
  3. C.80m.
  4. D.45m.
Show the answer and explanation

Answer: B (15m.)

Explanation

Apparent depth = real depth ÷ n. 80 ÷ (4/3) = 60 m and 60 ÷ (4/3) = 45 m, so the apparent depth changes by 60 − 45 = 15 m.