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How does the refractive index vary in Graded Index fibre?

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How does the refractive index vary in Graded Index fibre?

(a) Tangentially

(b) Radially

(c) Longitudinally

(d) Transversely

The question was asked during an interview.

I need to ask this question from Optical Fibre topic in portion Laser of Engineering Physics II

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Correct option is (b) Radially

The explanation: The refractive index of the core is maximum along the fibre axis and it gradually decreases. Here the refractive index varies radially from the axis of the fibre. Hence it is called graded index fibre.

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