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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a
15°
b
30°
c
45°
d
60°
answer is B.
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Detailed Solution
vm=12cμ=cvm=c12c=2 or 1sinic=2 or sinie=12 or ic=30∘