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The difference of speed of light in the two media A and B, ( υ A – υ B ) is 2.6 × 10 7 m/s. If the refractive index of medium B is 1.47, then the ratio of refractive index of medium B to medium A is : (Given: speed of light in vacuum C = 3 × 10 8 ms –1 )

1. 1.303
2. 1.318
3. 1.13
4. 0.12

Correct answer: 1.13

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