For one fibre, the speed of monochromatic light in the core is 1.97x10^8ms-1 and the speed in the cladding is 2.03x10^8ms-1.
calculate the critical angle for this light at the interface between the core and the cladding.
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The diagram shows a ray of monochromatic light, in the plane of the paper, incident on the end face of an optical fibre.
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