In optical fiber, refractive index of inner part is 1.68 and refractive index of outer part is 1.44. The numerical aperture of the fibre is
In an optical fibre, the refractive index of the core should be lesser than the refractive index of the cladding.
Find the refractive index of the core of an optical fiber if the critical angle is 60∘ and the refractive index of the cladding is √3?