ight traveling in a medium of index of refraction n_1 is incident on another medium having an index of refraction n_2. Under which of the following conditions can total internal reflection occur at the interface of the two media? (Select all that apply.) The indices of refraction have the relation n_2 > n_1. The indices of refraction have the relation n_1 > n_2. The angle of incidence is less than the critical angle. The angle of incidence is greater than the critical angle. The light propagates at a great speed in medium 1 than in medium 2.