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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 minimum 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⇒sin i≥sinc⇒sin i≥1μHence i≥sin−11μ or i≥30o

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