Q.

The velocity of light in a medium is half its velocity in air.  If 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

μ=cv⇒μ=cc/2=2 also for total internal reflectioni>c⇒sini≥sinc⇒sini≥1μ  Hence i≥sin−11μ or i≥30∘
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The velocity of light in a medium is half its velocity in air.  If ray of light emerges from such a medium into air, the angle of incidence, at which it will be totally internally reflected, is