If $\varepsilon_{0}$ and $\mu_{0}$ are the permittivity and permeability of free space and $\varepsilon$ and $\mu$ are the corresponding quantities for a medium,then the refractive index of the medium is:
- A$\sqrt{\frac{\mu_{0} \varepsilon_{0}}{\mu \varepsilon}}$
- B$\sqrt{\frac{\mu \varepsilon}{\mu_{0} \varepsilon_{0}}}$
- C$1$
- DInsufficient information
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