Question: A thin soap film (n = 1.32) suspended in air has a uniform thickness. When white light strikes the film at normal incidence, violet light (λV = 418 nm) is constructively reflected. At what angle of incidence will green light (λG = 562 nm) be most strongly reflected? Assume the film has the minimum thickness that can produce these reflections?
I want you to explain the physics in this problem.