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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 optical fibre used for communication purpose (refractive index of core `mu=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 fibre of length 1 km?

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