1. The problem statement, all variables and given/known data I am preparing for a test. I really need help with this is problem. I uploaded a picture for the figure. The figure below shows the path of a beam of light through several layers (n1 = 1.58, n2 = 1.39, n3 = 1.21 and n4 = 1.00) of different indices of refraction. PART1 ASKS: If = 29.1o, what is the angle, , of the emerging beam? PART 2: What must the incident angle, , be in order to have total internal reflection at the surface between the n3 = 1.21 medium and the n4 = 1.00 medium? 2. Relevant equations We have to use Snell's Law: which is n1sin=n2sin 3. The attempt at a solution FOR PART 1: This is what I did: I know N for 1 and 2. The angle is 29.1 as given. So.... sin^-1=(n1/n2*sin) sin^-1=(1.58/1.39*sin29.1). I get .662 which is off. For Part 2: I am clueless. Please guide me.