First slide

Total internal reflection - Ray optics and optical instruments

Question

A light ray falls perpendicular on one face of an equilateral prism, having refractive index $\sqrt{3}$ . The angle of deviation is:

Moderate

A

30
B

60
C

90
D

120

Solution

$C r i t i c a l A n g l e, θ_{c} = \sin^{- 1} (\frac{1}{μ}) = \sin^{- 1} (\frac{1}{\sqrt{3}})$
At point P ,
$60^{0} > \sin^{- 1} (\frac{1}{\sqrt{3}})$
Thus, total internal reflection occurs.
Deviation from original path is $30^{0} + 30^{0} = 60^{0}$ .
deviation =180-2xi=180-2x60= $60^{0}$

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