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Question 2
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 3×108ms1.

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Solution

Refractive index of a medium, nm = Speed of light in vacuumSpeed of light in the medium
Speed of light in vacuum, c=3×108ms1
Refractive index of glass, ng=1.50
Speed of light in the glass, v = Speed of light in vacuumRefractive index of glass
v=cng
v=3×1081.50=2×108ms1
Therefore, speed of light in the glass, v=2×108ms1

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