A wave has velocity $u$ in medium $P$ and velocity $2u$ in medium $Q.$ If the wave is incident in medium $P$ at an angle of $30°$ then the angle of refraction will be .... $^o$
Medium
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$v = \frac{{\sin i}}{{\sin r}} = \frac{{{v_1}}}{{{v_2}}}$
$\sin r = \sin 30^\circ \times \frac{{2u}}{u} $
$\Rightarrow \sin r = \frac{1}{2} \times 2 \times 1$
$ \Rightarrow r = 90^\circ $
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