Q. If $\varepsilon_{0}$ and $\mu_{0}$ represent the permittivity and permeability of vacuum and $\varepsilon$ and $\mu$ represent the permittivity and permeability of medium, then refractive index of the medium is given by
A) $\sqrt{\frac{\mu_{0}\varepsilon_{0}}{\mu\varepsilon}}$
B) $\sqrt{\frac{\mu\varepsilon}{\mu_{0}\varepsilon_{0}}}$
C) $\sqrt{\frac{\mu}{\mu_{0}\varepsilon_{0}}}$
D) $\sqrt{\frac{\mu_{0}\varepsilon_{0}}{\mu}}$
Explanation
(b) Refractive index$= \frac{c_{0}}{c} = \frac{1/\sqrt{\mu_{0}\varepsilon_{0}}}{1/\sqrt{\mu\varepsilon}}$
$= \sqrt{\frac{\mu\varepsilon}{\mu_{0}\varepsilon_{0}}}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.