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The speed of light in vacuum and in two different glasses is given in the table below: Medium Speed of light Vacuum 3.00 × 108m/s Flint glass 1.86 × 108m/s Crown glass 1.97 × 108m/s a) Calculate the absolute refractive indexes of flint glass and crown glass. Calculate the relative refractive index for light going from crown glass to flint glass.

ScienceClass 10ICSEAnswered 27 Mar 2026
Answer
  1. Refractive index of flint glass = (speed of light in vacuum)/(speed of light in flint glass) = 61 Refractive index of crown glass = (speed of light in vacuum)/(speed of crown glass) = 1.52
  2. Relative refractive index of crown glass to flint glass = (speed of light in crown glass)/(speed of light in flint glass) = 059

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