1. The problem statement, all variables and given/known data Unpolarized light hits a flat glass surface, 37.5 degrees to the surface's normal. The reflected light's polarization is investigated with a polaroid. The relationship between the max and min value of intensity from the polaroid when it is rotated is 4.0. What is the index of refraction of the glass? 2. Relevant equations Fresnel's equations and Shell's law. 3. The attempt at a solution I have got no clue, and I've gotten rather frustrated. The only thought I have is that the reflected polarized intensity is 1.5 times that of the non-polarized reflected intensity. Please aid me, I do not enjoy this part of physics, while I love most other.