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Velocity of light in glass whose refractive index with respect to air is 1.5 is 2  10 8 m/s and in certain liquid the velocity of light found to be 2.5  10 8 m/s . The refractive index of the liquid with respect to air is

1. 0.64
2. 0.80
3. 1.20
4. 1.44

Correct answer: 1.20

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