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JAMB Physics 1983 Question 7

Question 7

Refraction of Light

The refractive index of a liquid is 1.5. If the velocity of light in vacuum is 3.0 × 108 m s−1, the velocity of light in the liquid is

  1. A.1.5 × 108 m s−1
  2. B.2.0 × 108 m s−1
  3. C.3.0 × 108 m s−1
  4. D.4.5 × 108 m s−1
  5. E.9.0 × 108 m s−1
Show the answer and explanation

Answer: B (2.0 × 108 m s−1)

Explanation

v = c/n = 3.0 × 108 ÷ 1.5 = 2.0 × 108 m s−1.