First slide

Introduction to waves

Question

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

Easy

A

30°
B

45°
C

60°
D

90°

Solution

$v = \frac{sini}{sinr} = \frac{v_{1}}{v_{2}}$
$\Rightarrow sinr = \sin 30 ° \times \frac{2 u}{u} \Rightarrow sinr = \frac{1}{2} \times 2 \times 1 \Rightarrow r = 90 °$

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