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Question
Speed of light in glass is 2 ×108 ms−1. What is refractive index of glass?
Numerical
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Solution
Speed of light in glass (v) = 2 ×108 ms−1
Standard speed of light in vacuum (c) = 3 ×108 ms−1
\[ \text{Refractive Index } (\mu) = \frac{\text{Speed of light in vacuum/air } (c)}{\text{Speed of light in the medium } (v)} \]
\[ \mu = \frac{3 \times 10^{8} \ \mathrm{ms^{-1}}}{2 \times 10^{8} \ \mathrm{ms^{-1}}} \]
\[= \frac{3}{2}\]
= 1.5
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