If $ε_0$ and $\mu_0$ represent the permittivity and permeability of vacuum and ε and $\mu$ represent the permittivity and permeability of medium, then refractive index of the medium is given by
Answer & explanation
Correct answer: option 2
Refractive index $ = \frac{c}{v}=\frac{1/\sqrt{\mu_0ε_0}}{1/\sqrt{\mu ε}}$
$=\sqrt{\frac{\mu ε}{\mu_0ε_0}}$