Electromagnetic Waves in a Medium

2022 1 question

1. 1 Electromagnetic Waves Easy
   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)
   A $v=\frac{c}{\sqrt{\epsilon_r\mu_r}}$ B $v=c$ C $v=\sqrt{\frac{\mu_r}{\epsilon_r}}$ D $v=\sqrt{\frac{\epsilon_r}{\mu_r}}$
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