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Question

Speed of light in air is 3×108m/s and speed of light in common glass is 2×108m/s.Calculate the refractive index of glass.


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Solution

Step 1. Given data

  1. Speed of light in air is 3×108m/s
  2. Speed of light in common glass is 2×108m/s

Step 2. Formula used

Refractive index of medium B with respect to medium A , ηBA=SpeedoflightinmediumASpeedoflightinmediumB , that is when light travel from medium A to medium B

Step 3. Find the refractive index of glass.

Refractive index of glass, with respect to air is ηglass=SpeedoflightinvacuumSpeedoflightinglass=3×1082×108=32=1.5

Hence, the refractive index of glass is 1.5.


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