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JAMB Physics 2004 Question 1

Question 1

Refraction of Light

The refractive index of the medium M in the diagram above is

Diagram for this question
  1. A.2/√3
  2. B.1/√3
  3. C.2√3
  4. D.√3
Show the answer and explanation

Answer: D (√3)

Explanation

The ray meets the surface at 30°, so the angle of incidence is 60°; inside M it makes 60° with the surface, so the angle of refraction is 30°. n = sin 60° ÷ sin 30° = √3.