The critical angle for a denser-rarer interface is 45∘. The speed of light in rarer medium is 3×108ms−1. The speed of light in the denser medium is:
Held on 11 Apr 2023 · Verified 6 Jul 2026.
3.12×107ms−1
5×107ms−1
2.12×108ms−1
2×108ms−1
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