Light enters from air to glass having refraction index 150 What is the speed of light in glass? the speed of light in vacuum is 3 × 10 by 8 5 - 1
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Refractive index of a medium, nm = Speed of light in vacuum/Speed of light in the medium
Speed of light in vacuum, c = 3 — 108 ms-1
Refractive index of glass, ng = 1.50
Speed of light in the glass, v = Speed of light in vacuum/ Refractive index of glass
= c/ng
=3 — 108/1.50 = 2x 108 ms-1.
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