Question

Internal critical angle at core-cladding interface of a step indax fibre is 80.6 calculated maximum acceptance angle when cladding refractive index is 1.48

Answer 1

Answer:

Sol: Let the refractive index of core, n1 = 1.48

and the refractive index of cladding , n2 = 1.45

Numerical aperture (NA) images

images

Let θ0 be the acceptance angle

n2 sin 90 = n1 sin θc [θc = critical angle]

The fractional refractive ...