Light wave enters from medium 1 to medium 2. Its velocity in 2^ nd medium is double from 1^ st . For total internal reflection the angle of incidence must be greater than

Correct answer: A. 30^ Total internal reflection occurs when the angle of incidence is greater than critical angle (C) in the denser medium. ^1 μ_2= Velocity of light in medium '1' Velocity of light in medium ' 2 ' ^1 μ_2=(v)/(2 v)=(1)/(2) . Medium ' 1 ' is denser. or C=(1)/(2)= 30^ or C=30^ .

AIIMS 2016

Exam: AIIMS
Year: 2016
Subject: Physics
Chapter: Ray Optics

AIIMS 2016 · Physics · Ray Optics

Light wave enters from medium 1 to medium 2. Its velocity in 2^ nd...

Light wave enters from medium 1 to medium 2. Its velocity in

2^{\text{nd }}

medium is double from

1^{\text{st }}

. For total internal reflection the angle of incidence must be greater than

Options

A $30^{\circ}$
B $60^{\circ}$
C $45^{\circ}$
D $90^{\circ}$

Correct answer

A. $30^{\circ}$

Step-by-step solution

Total internal reflection occurs when the angle of incidence is greater than critical angle (C) in the denser medium.

{ }^1 \mu_2=\frac{\text{ Velocity of light in medium '1' }}{\text{ Velocity of light in medium ' } 2}

{ }^1 \mu_2=\frac{v}{2 v}=\frac{1}{2}

. Medium ' 1 ' is denser. or

\sin C=\frac{1}{2}=\sin 30^{\circ}

C=30^{\circ}

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