When Light Is Totally Polarized by Reflection at an Interface $\theta$

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 $\theta$ = 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.