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The refractive index of a core of an optical fibre is u 2 and that of the cladding is u 1 the angle of incidence on the face of the core so that the light ray just under goes total internal reflection at the cladding is

The refractive index of a core of an optical fibre is u and that of the cladding is u1 the angle of incidence on the face of the core so that the light ray just under goes total internal reflection at the cladding is
 
 

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