The velocity of light in a medium is half its velocity in air. If a ray of light emerges from such a medium into air, the angle of incidence, at which it will be totally internally reflected, is

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The velocity of light in a medium is half its velocity in air. If a ray of light emerges from such a medium into air, the angle of incidence, at which it will be totally internally reflected, is

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15°

30°

45°

60°

answer is B.

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Detailed Solution

Max angle is the critical angle, velocity is halved, hence $μ_{r} = 2$

$θ_{C} = S i n^{- 1} \frac{1}{μ_{r}} = S i n^{- 1} \frac{1}{2} = 30^{0}$

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