Physics - Geometrical Optics Question with Solution | TestHub

We know that velocity of electromagnetic wave in vacuum $\left({\mathrm{v}}_0\right)=\frac{1}{\sqrt{{\mu }_0{\epsilon }_0}}$ and velocity of electromagnetic wave in medium is $\text{(v) }=\frac{1}{\sqrt{\mu \epsilon }}\text{. }$ Therefore refractive index of the medium $\begin{array}{rl}(\mu )& =\frac{\text{ Vel. of E.M. wave in vacuum }\left({\mathrm{v}}_0\right)}{\text{ Vel. of E.M. wave in medium(v) }}\\ & =\frac{1/\sqrt{{\mu }_0{\epsilon }_0}}{1/\sqrt{\mu \epsilon }}=\sqrt{\frac{\mu \epsilon }{{\mu }_0{\epsilon }_0}}\end{array}$