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Q.

A light ray from air is incident (as shown in figure) at one end of a glass fiber (refractive index μ = 1.5) making an incidence angle of 60° on the lateral surface, so that it undergoes a total internal reflection.  How much time would it take to traverse the straight fiber of length 1 km

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a

3.33 μ sec

b

6.67 μ sec

c

5.77  μ sec

d

3.85 μ sec

answer is D.

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Detailed Solution

When total internal reflection just takes place from lateral surface i=C i.e., 60∘=CTime taken by light to traverse some distance in a medium t=μxc=23×1033×108=3.85 μsec
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