I did a lab in school where I took a triangular prism and shined light though it. I measured the angle of incidence and angle of refraction for three different angles. The lab question first told me to find the index of refraction of the prism using the two angles. That was easy. The next question asked: “Using the two pairs of angles for the triangle, calculate the index of refraction for the prism for each set of angles.” I don’t know what I’m supposed to calculate here.