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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