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JAMB Physics 2002 Question 14

Question 14

Refraction of Light

A coin placed below a rectangular glass block of thickness 9 cm and refractive index 1.5 is viewed vertically above the block. The apparent displacement of the coin is

  1. A.8cm
  2. B.6 cm
  3. C.5 cm
  4. D.3cm
Show the answer and explanation

Answer: D (3cm)

Explanation

Apparent depth = 9/1.5 = 6 cm, so the coin appears raised by 9 − 6 = 3 cm.