First slide

Nature of electromagnetic wave

Question

It $μ_{r}$ be the relative permeability and $k_{r}$ the relative dielectric constant of a medium, its refractive index is given by

Moderate

A

$\frac{1}{\sqrt{μ_{r} k_{r}}}$
B

$\frac{1}{μ_{r} k_{r}}$
C

$\sqrt{μ_{r} k_{r}}$
D

$μ_{r} k_{r}$

Solution

$R e f r a c t i v e i n d e x, n = \frac{c}{v}$
Now $c = \frac{1}{\sqrt{μ_{0} k_{0}}} and v = \frac{1}{\sqrt{μ_{0} k_{0} μ_{r} k_{r}}}$
$∴ n = \sqrt{μ_{r} k_{r}}$

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