When light propagates through a material medium of relative permittivity $\varepsilon_{r}$ and relative permeability $\mu_{r}$,the velocity of light,$v$,is given by: ($c$ = velocity of light in vacuum)
- A$v=\sqrt{\frac{\mu_{r}}{\varepsilon_{r}}}$
- B$v=\sqrt{\frac{\varepsilon_{r}}{\mu_{r}}}$
- C$v=\frac{c}{\sqrt{\varepsilon_{r}\mu_{r}}}$
- D$v=c$
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