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JAMB Physics 1997 Question 35

Question 35

Refraction of Light

Light of velocity 3.0 × 108 m s−1 is incident on a material of refractive index n. If the velocity of light is reduced to 2.4 × 108 m s−1 in the material, what is n?

  1. A.2.33
  2. B.2.25
  3. C.1.33
  4. D.1.25
Show the answer and explanation

Answer: D (1.25)

Explanation

n = speed in air ÷ speed in material = 3.0 × 108 ÷ 2.4 × 108 = 1.25.