A light ray going 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 fibre of length 1 km?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
When total internal reflection just takes place from lateral surface, 
, i.e. 
Time taken by light to traverse some distance in a medium,
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