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A light ray going from air is incident (...

A light ray going from air is incident (as shown in figure) at one end of a glass fibre (refractive index `mu`-15) 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 fibre of length 1 km?

A

`3.33 mu sec`

B

`6.67 mu sec`

C

`3.85mu sec`

D

`5.77mu sec`

Text Solution

Verified by Experts

The correct Answer is:
D
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