Physics · Ray Optics

If v 1 and v 2 are the velocities of light in medium 1 and medium 2 respectively, then the refractive index of medium 2 with respect to medium 1 (μ 21 ) is:

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v 1 v 2

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If v 1 and v 2 are the velocities of light in medium 1 and medium 2 respectively, then the refractive index of medium 2 with respect to medium 1 (&mu; 21 ) is: