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When light propagates through a material medium of relative permitivity \( \epsilon_{\mathrm{r}} \) and relative permeability \( \mu_{\mathrm{r}} \), the velocity of light, \( \mathrm{v} \) is given by : (c - velocity of light in vacuum)
(1) \( \mathrm{v}=\frac{\mathrm{c}}{\sqrt{\epsilon_{\mathrm{r}} \mu_{\mathrm{r}}}} \)
(2) \( \mathrm{v}=\mathrm{c} \)
(3) \( \mathrm{v}=\sqrt{\frac{\mu_{\mathrm{r}}}{\epsilon_{\mathrm{r}}}} \)
(4) \( \mathrm{v}=\sqrt{\frac{\epsilon_{\mathrm{r}}}{\mu_{\mathrm{r}}}} \)
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