A thin film of oil (n=1.24) is laying on a flat piece of glass (n=1.83). When viewed through air normal to the oil film, constructive interference produces a band with a bright blue color (wavelength= 505 nm).
a) What is the phase shift or phase change (in degrees or in fractions of a wavelength-specify air or film) for the reflected light off the air-oil surface?
b) What is the phase shift or phase change (in degrees or in fractions of a wavelength-specify air or film) for the reflected light off the oil-glass interface?
c) What is the minimum thickness of the oil film in nm?