If ${\epsilon }_0$ and ${\mu }_0$ represent the permittivity and permeability of vacuum and $\epsilon$ and $\mu$ represent the permittivity and permeability of medium, the refractive index of the medium is given by

• A

  $\sqrt{\frac{{\mathrm{\epsilon }}_0{\mathrm{\mu }}_0}{\mathrm{\epsilon \mu }}}$

• B

  $\sqrt{\frac{\mathrm{\epsilon \mu }}{{\mathrm{\epsilon }}_0{\mathrm{\mu }}_0}}$

• C

  $\sqrt{\frac{\mathrm{\epsilon }}{{\mathrm{\mu }}_0{\mathrm{\epsilon }}_0}}$

• D

  $\sqrt{\frac{{\mathrm{\mu }}_0{\mathrm{\epsilon }}_0}{\mathrm{\epsilon }}}$