A light ray from air is incident (as shown in figure) at one end of a glass fiber (refractive index, \\mu=1.5 ) making an incidence angle of 60^\circ 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} ?

Manipal Entrance Test 2019 Physics Paper

Question : 37 of 50

Marks: +1, -0

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 1‌km ?

3.33 µs
6.67 µs
5.77 µs
3.854 µs

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