[" In optical fibres,the refractive "],[" index of the core is "]

In opticle fibres,the refractive index of the core is

In opticle fibres,the refractive index of the core is

In an optical fibre ,the refractive index of the core material is

In an optical fibre ,the refractive indices of the core and the cladding are given by n_(1) and n_(2) respectively . Light can travel through the optical fibre if

In optical fibre refractive index of core is

In optical fibre refractive index of core is

For an optical fibre ,the ratio of the refractive index of the core to the refractive index of the cladding is 1.25 . What is the critical angle at the core cladding interface ?

In optical fiber the refractive index of the material of the core is………. That of the cladding.