Question: how to solve this problem? 6. )A light ray enters the core of a straight optical fibre from air at position P as shown. It

how to solve this problem?

6. )A light ray enters the core of a straight optical fibre from air at position P as shown. It is then totally reflected at position Q. The refractive indices of the core and the cladding are 1.47 and 1.45 respectively. (a) What is the maximum angle of incidence at P so that total internal reflection occurs at Q 7? (b) The fibre is 2 km long. Find the longest time for light to travel from one end to the other. Given speed of light in air is 3 x 10 ms

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