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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
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$30^{\circ}$
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 $\sin C=\frac{1}{2}=\sin 30^{\circ}$ or $C=30^{\circ}$.
${ }^1 \mu_2=\frac{\text { Velocity of light in medium '1' }}{\text { Velocity of light in medium ' } 2}$ '
${ }^1 \mu_2=\frac{v}{2 v}=\frac{1}{2}$. Medium ' 1 ' is denser.
or $\sin C=\frac{1}{2}=\sin 30^{\circ}$ or $C=30^{\circ}$.
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