A wave has velocity u in medium P and velocit | vedclass

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(D) According to Snell's Law for waves,the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of

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(D) According to Snell's Law for waves,the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the velocities in the respective media:$\frac{\sin i}{\sin r} = \frac{v_1}{v_2}$Given:Angle of incidence $i = 30^\circ$Velocity in medium $P$ $(v_1)$ = $u$Velocity in medium $Q$ $(v_2)$ = $2u$Substituting the values into the formula:$\frac{\sin 30^\circ}{\sin r} = \frac{u}{2u}$$\frac{0.5}{\sin r} = \frac{1}{2}$$\sin r = 0.5 	imes 2 = 1$Since $\sin r = 1,$ the angle of refraction $r = 90^\circ.$

$A$ 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 $30^\circ,$ then the angle of refraction will be .... $^o$

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