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

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Total internal reflection occurs when the angle of incidence is greater than critical angle (C) in the denser medium.
$^{1} μ_{2} = \frac{Velocity of light in medium ’1’}{Velocity of light in medium ’ 2}$ ' $^{1} μ_{2} = \frac{v}{2 v} = \frac{1}{2}$ . Medium ' 1 ' is denser. or $sin C = \frac{1}{2} = sin 3 0^{\circ}$ or $C = 3 0^{\circ}$ .

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