If n₂₁ is the refractive index of medium 1 with respect to medium 2, what is its relation to n₁₂? - OPTICS Quiz | GKFix.in

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Question

If n₂₁ is the refractive index of medium 1 with respect to medium 2, what is its relation to n₁₂?

A. n₂₁ = n₁₂
B. n₂₁ = 2n₁₂
C. n₂₁ = 1/n₁₂
D. n₂₁ = n₁₂²

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