1. The problem statement, all variables and given/known data Two rays of light fall on a surface of the prism. Do they remain parallel after they come out from the prism? 2. Relevant equations sina/sinb=n2/n1 3. The attempt at a solution I think they do, as the incidence angles are equal, the refraction angles are equal they become incidence angles which are still equal and will have equal refraction angles.