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Question
The speed of light in diamonds is 125,000 km s-1. What is its refractive index? (speed of light in air = 3 × 108 ms-1).
Solution
Given,
Speed of light in diamond, v = 125 × 106 m/s
Speed of light in air, c = 3 × 108 m/s
Refractive index of diamond, μ D = ?
We know that,
`c/v=µ `
∴ `µ= (3xx10^8 "m/s") /(125xx10^6 "m/s")=2.4`.
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