1. The problem statement, all variables and given/known data I need to derive an expression for the displacement of light as a function of thickness of glass and the angles. I will post a screen shot of the formula to be derived but it can also be found here http://clas.wayne.edu/multimedia/usercontent/File/Physics%20and%20Astronomy/Labs/PHY5341/Lab4%20Brewsters%20Angle.pdf [Broken] (pg 3) 2. Relevant equations The equation is given as the solution. I am not very good with geometry so I don't really even know where to begin. 3. The attempt at a solution Using Snell's law, n1sinθ1=n2sinθ2 Solving for θ2 = Arcsin[(n1/n2)sinθ1] So then I just have θ2. Help, please?