Question

if the acceptance cone for the given fiber is 68.16 calculate the maximum entrance angle and numerical aperture if the cladding glass has a refractive index of a 1.52 calculate the refractive index of cone

Answer 1

$NA=n\sin \alpha=1.41,$

$\alpha_{max}=\alpha \sqrt{ NA}=80.94°,$

$n'=NA=1.41.$