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JAMB Physics 1983 Question 46

Question 46

Refraction of Light

The speed of light in vacuum is 3.0 × 108 m s−1. If the refractive index of a transparent liquid is 4/3, then the speed of light in the liquid is

  1. A.0.44 × 108 m s−1
  2. B.2.25 × 108 m s−1
  3. C.3.0 × 108 m s−1
  4. D.4.0 × 108 m s−1
  5. E.4.33 × 108 m s−1
Show the answer and explanation

Answer: B (2.25 × 108 m s−1)

Explanation

v = c/n = 3.0 × 108 ÷ (4/3) = 2.25 × 108 m s−1.