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?
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Updated on : 2022-09-05
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Correct option is D)
When total internal reflection tales place from lateral surface, i=C
Time taken by the light to travel some distance in medium t=cμx
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