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Refraction of light

3 PYQ across 2 exams · 2020–2025 — the complete chronological timeline of how UPSC has tested this idea, oldest to newest.

CDS 2020 → NDA 2025
20201 PYQ
CDSQ11
If the speed of light in air is 3×10⁸ m/s, then the speed of light in a medium of refractive index 3/2 is…
20252 PYQs
NDAQ141
If the speed of light in carbon disulfide and vacuum is X and Y respectively, then…
NDAQ144
When a light ray passes through from air to water with a non-zero angle the ray will be…
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