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Question
The speed of light in air is 3 × 108 m s-1. Calculate the speed of light in glass. The refractive index of glass is 1.5.
Solution
Given,
Speed of light in air, c = 3 × 108 m/s-1
Refractive index of glass, 𝛍 = 1.5
Speed of light in glass, v = ?
We know that,
∴ `c/v=µ `
∴ `v=(3xx10^8"m/s")/1.5`
`v=2xx10^8"m/s"^-1`
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