Question

In 'Total internal reflection' the value of angle of refraction related to corresponding, critical angle is

Answer 1

total internal reflection value

from snells law ${\mu }_{1}sini={\mu }_{2}sinr$

at critical angle $r={90}^0$

${\mu }_{1}sini={\mu }_{2}sin{90}^0$

$sini=\frac{{\mu }_2}{{\mu }_1}$

if $i>si{n}^{-1}\frac{{\mu }_2}{{\mu }_1}$ we get total internal reflection