Question

What should be the maximum acceptance angle at the aircore interface of an optical fibre if `n_(1)` and `n_(2)` are the refractive indices of the core and the cladding, respectively
A. `sin^(-1)(n_(2)//n_(1))`
B. `1sin^(-1)sqrt(n_(1)^(2)-n_(2)^(2))`
C. `[tan^(-1)"(n_(2))/(n_(1))]`
D. `[tan^(-1)"(n_(1))/(n_(2))]`

Answer 1

Correct Answer - B
Core of acceptance angle `theta=sin^(-1)sqrt(n_(1)^(2)-n_(2)^(2))`