First slide

Ray optics

Question

The angle of minimum deviation by prism is (180°–2A). Its critical angle will be

Moderate

A

$\sin^{- 1} (\tan \frac{A}{2})$
B

$\sin^{- 1} (\cot \frac{A}{2})$
C

$\cos^{- 1} (\cot \frac{A}{2})$
D

$\cos^{- 1} (\tan \frac{A}{2})$

Solution

$μ = \frac{\sin (\frac{A + 180 - 2 A}{2})}{\sin A / 2}; μ = \cot (\frac{A}{2}) μ = \frac{1}{\sin c}; \frac{1}{\sin c} = \cot \frac{A}{2} \Rightarrow c = \sin^{- 1} (\tan \frac{A}{2})$

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