railway RRB JE (CBT I + CBT II) Mock Test 2024 Electromagnetic Theory Waveguides and Guided Waves Optical Fiber
In graded index multimode optical fiber, the refractive index of the core is
1
uniform across its radial distance, except for the cladding
2
maximum at the fiber axis and decreases stepwise towards the cladding
3
maximum at the fiber axis and decreases gradually towards the cladding
4
maximum at the fiber axis and increases stepwise towards the cladding