When Light Is Totally Polarized by Reflection at an Interface

Multiple Choice

When light is totally polarized by reflection at an interface between two materials where the index of refraction for the incident medium is n₁ and for the other is n₂, the incident angle is given by θ = tan^-1(n₂/n₁) . This equation holds

A) only when n₂ > n₁.
B) only when n₁ > n₂.
C) only when n₂ > n₁ + 1.
D) only when n₂ < n₁ + 1.
E) for all values of n₁ and n₂.