If n₂₁ is the refractive index of medium 2 w.r.t. medium 1, then n₁₂ e…

Question

If n₂₁ is the refractive index of medium 2 w.r.t. medium 1, then n₁₂ equals:

Accepted Answer

B. 1 / n₂₁

**n₁₂ = 1 / n₂₁** (reversibility of light).
Also, for three media: **n₃₁ = n₃₂ × n₂₁** (or equivalently n₃₂ = n₃₁ × n₁₂).

Answer

n₂₁

Answer

n₂₁²

Answer

1 − n₂₁

If n₂₁ is the refractive index of medium 2 w.r.t. medium 1, then n₁₂ equals: