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IFoS · Paper I · Waves & Opticsifos-2025-subject-02-008

Optical fibre — UPSC Physics Optional IFoS 2025 Paper I

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What do you understand by pulse dispersion in multimode optical fibres? Deduce an expression for intermodal pulse dispersion in a step-index fibre. Also compare the pulse dispersions of the step-index fibres with the parabolic-index fibres.

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