1. The problem statement, all variables and given/known data Derive an equation relating the angle of incidence and the angle of refraction as light travels from air to glass. Do it in the form of Θ2/Θ1 = expression 2. Relevant equations I think the equation to use here is Snell's law. Right? n1sinΘ1 = n2sinΘ2 n1 = nair = 1.0003 approximately 1 n2 = nglass Θ1 = angle of incidence Θ2 = angle of refraction 3. The attempt at a solution n1sinΘ1 = n2sinΘ2 n1/n2 = (sinΘ2)/(sinΘ1) 1/n2 = (sinΘ2)/(sinΘ1) However, I'm having problems on how to remove the sin on the right side of my equation. I know I can't just apply arcsin to both sides since that wouldn't remove the sin in both the numerator and the denominator of my fraction. Please help!