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The critical angle for a denser-rarer interface is 45°. The speed of light in rarer medium is 3 × 10 8 m/s. The speed of light in the denser medium is:

1. 3.12 × 10 7 m/s
2. 5 × 10 7 m/s
3. 2.12 × 10 8 m/s
4. s / m 10 2 8 

Correct answer: 2.12 × 10 8 m/s

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