Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 x 10^8 ms-1.

Answer:

Given parameters

Speed of light in vacuum (c) = 3 × 10⁸ ms^-1

Refractive index of glass (n_g) = 1.50

Refractive index of a medium = Speed of light in vacuum/Speed of light in the medium

Refractive index of glass = Speed of light in vacuum/Speed of light in the glass

Speed of light in the glass (v) = Speed of light in vacuum/ Refractive index of glass

v = c/n_g

v = (3 × 10⁸)/1.50

v = 2 × 10⁸ ms^-1

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