First slide

Prism

Question

Angle of a prism is 30° and its refractive index is $\sqrt{2}$ and one of the surface is silvered. At what angle of incidence, a ray should be incident on one surface so that after reflection from the silvered surface, it retraces its path.

Moderate

A

30°
B

60°
C

45°
D

$\sin^{- 1} \sqrt{1 .5}$

Solution

$A = r + 0 \Rightarrow r = 30^{\circ} From Snell ’ s law at surface AB μ = \frac{sini}{sinr} \Rightarrow \sqrt{2} = \frac{sini}{\sin 30^{\circ}} \Rightarrow i = 45 °$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App