1. The problem statement, all variables and given/known data A uniaxial crystal of indices n0 and ne is cut so that the optic axis is perpendicular to the surface. Show that for light from the outside at an angle of incidence θi, the angle of refraction of the e-ray is 2. Relevant equations 3. The attempt at a solution I solved for ne by dividing both sides of the third equation by what appears to be an ellipse equation and taking the square root of both sides, then plugging it in into Snell's law (the second equation). It's become ugly and confusing, though. Help is appreciated.