What should be the maximum acceptance angle at the aircore interface of an optical fibre if 1 n and 2 n are the refractive indic

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

What should be the maximum acceptance angle at the aircore interface of an optical fibre if 1 n and 2 n are the refractive indices of the core and the

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