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