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Standard XII

Physics

Propagation of Waves

A wave has ve...

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 $30^{\circ}$ then the angle of refraction will be

30°

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45°

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60°

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90°

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Solution

The correct option is D 90°
$\frac{s i n i}{s i n r} = \frac{v_{1}}{v_{2}}$

$\Rightarrow s i n r = s i n 30^{\circ} \times \frac{2 u}{u} \Rightarrow s i n r = \frac{1}{2} \times 2 \times 1 \Rightarrow r = 90^{\circ}$

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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

The correct option is D 90°sin isin r=v1v2 ⇒ sin r=sin 30∘× 2uu⇒ sin r =12×2×1 ⇒ r=90∘

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

The correct option is D 90°
$\frac{s i n i}{s i n r} = \frac{v_{1}}{v_{2}}$

$\Rightarrow s i n r = s i n 30^{\circ} \times \frac{2 u}{u} \Rightarrow s i n r = \frac{1}{2} \times 2 \times 1 \Rightarrow r = 90^{\circ}$