You have a thin film of oil sitting (n = 1.510) sitting on water (n = 1.333). When light with a wavelength of 550.0 nm is incident on the film it interferes constructively.
a) Find the 3 smallest possible thicknesses for this thin film.
b) For the thickest film you found in part a): what are the 3 longest wavelengths of light that will interfere destructively?