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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)
A
$v=\frac{c}{\sqrt{\epsilon_r\mu_r}}$
B
$v=c$
C
$v=\sqrt{\frac{\mu_r}{\epsilon_r}}$
D
$v=\sqrt{\frac{\epsilon_r}{\mu_r}}$