Question

Question 4. The refractive indices of glass and water with respect to air are 3/2 and 4/3 respectively. If
speed of light in glass is 2* 108 m/s, find the speed of light in water.
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Answer 1

Explanation:

ng = 3/2 and nw = 4/3. Absolute Refractive Index of a medium = Speed of light in vacuum/Speed of light in the medium Speed of light in glass = 2 x 108m/s Speed of Light in Vacuum = (3/2) x 2 x 108 m/s = 3 x 108 m/s Speed of light in water = (3 x 108 m/s)/(4/3)                                        = 2.25 x 108 m/s