Question

If the maximum acceptance angle of an optical fibre without cladding is θ=tan−1(√3) then the refractive index of the optical fiber will be (1) 2 (2) 1.5 (3) 1.3 (4) 3​

Answer 1

Explanation:

The maximum angle of incidence (i) in air for which all the incident light is totally reflected at the interface of a pair of media having refractive indices and is given by

This value of the maximum angle of incidence is known as acceptance angle.