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# A light ray from air is incident ( as shown in figure ) at one end of a glass fibre (refractive index, μ=1.5 ) making an incidence angle of 60o 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?3.33μs6.67μs5.77μs3.85μs

A
5.77μs
B
3.85μs
C
3.33μs
D
6.67μs
Solution
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