Anyone? This is part of a much larger project and I can well assume that it is indeed pi, the point is that I don't want to make too many undue assumptions.
Homework Statement
Part of a longer question, what is the phase change, if any for a system of three substances of different n where there is surface reflection between n1 and n_f which is meant to constructively interfere with another surface reflection between n_f and n3.where n1 < n_f >...