1. The problem statement, all variables and given/known data A coating of n1 = 1.33 material is to be added to n2 = 1.50 glass, in order to make it "irridescent." a) What is the thinnest layer of material which will have a reflection maximum for normal-incidence light at BOTH 400 and 600 nm (vacuum) wavelength? b) This thickness will have a reflection minimum at some wavelength between 400 and 600 nm. What is the wavelength of the reflection minimum? Known: n1 = 1.33 (coating) n2 = 1.50 (glass) 3. The attempt at a solution I drew a diagram, but I don't know how to begin to go about this problem. Can someone please guide me? I also know there's a 180 phase change because n2 > n1.