1. The problem statement, all variables and given/known data I have to design an experiment to determine the difference in refractive indices for different colors. Assume you have : color filters,glass block 2. Relevant equations 3. The attempt at a solution I want to do it buy shining a white laser light through filters into the glass block and measuring the angle of incidence and refraction using a protractor. But they say to take into account the fact that the variation of refractive index with frequency is very small. So what else can I do to take that into account?