If `mu` and `mu_(2)` are the refractive indices of the materials of core and cladding of an optical fibre, then loss of light due to its leakage can be minimised by having

If mu_(1) and mu_(2) are the refractive indices of the materials of core and cladding of an optical fibre, then the loss of light due to its leakage can be minimized by having

If mu_(1) and mu_(2) are the refractive indices of the material of core and cladding respectively of an optical fiber, then

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

If mu_1 and mu_2 are the refractive indices of two media in which the velocities of light are v_1 and v_2 , then,

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