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Electromagnetic Waves
Electromagnetic Waves in a Medium
1 question, with its answer.
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When light propagates through a material medium of relative permittivity $\epsilon_r$ and relative permeability $\mu_r$, the velocity of light, $v$ is given by : ($c$ - velocity of light in vacuum)Refractive index of the medium $n = \sqrt{\epsilon_r\mu_r}$ $n = \frac{c}{v} \Rightarrow v = \frac{c}{n}$ $v = \frac{c}{\sqrt{\epsilon_r\mu_r}}$
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