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JAMB Physics 2009 Question 35

Question 35

Refraction of Light

When light passes through two media x and y of refractive indices 1.51 and 1.33 respectively, the speed of light in

  1. A.x is same as in y.
  2. B.x and y is same as in vacuum.
  3. C.x is higher than in y.
  4. D.y is higher than in x.
Show the answer and explanation

Answer: D (y is higher than in x.)

Explanation

The speed of light in a medium is c/n. The smaller refractive index (y, 1.33) gives the higher speed.