railway RRB JE (CBT I + CBT II) Mock Test 2024 Electromagnetic Theory Waveguides and Guided Waves Optical Fiber
The refractive index of the core is uniform throughout and undergoes an abrupt change at the cladding boundary which is known as ______.
1
uniform-index fibre
2
scale-index fibre
3
graded-index fibre
4
step-index fibre