Question

A light ray from air is incident ( as shown in figure ) at one end of a glass fibre (refractive index, ) making an incidence angle of 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

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A

B

C

D

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Updated on : 2022-09-05
Solution
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Correct option is D)

When total internal reflection tales place from lateral surface,




Time taken by the light to travel some distance in medium  


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