In graded index multimode optical fiber the refractive index

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In graded index multimode optical fiber the refractive index of the core is

[ESE (IES) EC 2017 Technical]

A uniform across its radial distance except for the cladding

B maximum at the fiber axis and decreased stepwise towards the cladding

C maximum at the fiber axis and decreases gradually towards the cladding.

D maximum at the fiber axis and increases stepwise towards the cladding