Official PYQ · 2021Set 1 · Q25Transmission LinesNAT1 mark

GATE EC 2021 Set 1 Q25 — Transmission Lines

The refractive indices of the core and cladding of an optical fiber are $1.50$ and $1.48$ , respectively. The critical propagation angle, which is defined as the maximum angle that the light beam makes with the axis of the optical fiber to achieve the total internal reflection, (rounded off to two decimal places) is _____ degree.

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Answer: 9.30:9.44

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Published 10 Oct 2026

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