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The speed of light in air is 3 × 108m/s. In medium X its speed is 2 × 108m/s and in medium Y the speed of light is 2.5 × 108m/s. Calculate: a) relative refractive index of air and X b) relative refractive index of air and Y relative refractive index of X and Y

ScienceClass 10ICSEAnswered 27 Mar 2026
Answer
  1. Relative refractive index of air and X = (speed of light in air)/(speed of light in medium X) = 5
  2. Relative refractive index of air and Y = (speed of light in air)/(speed of light in medium Y) = 2
  3. Relative refractive index of X and Y = (speed of light in X)/(speed of light in Y) = 8

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