1. The problem statement, all variables and given/known data Consider a beam of unpolarised light incident onto air from a crown-glass with a refractive index of 1.52. Given that the incident light intensity has a power of 10mW, find the minimum incident angle when the power of the refracted light becomes zero. 2. Relevant equations I have no idea what equations can be used to solve this. 3. The attempt at a solution From what I understand, the unpolarised light can lead to a reflected polarised beam and a refracted beam- this happens if the angle of incident is Brewster's Angle. I am guessing the power of the refracted light is zero if the reflected light is fully polarised?