A thin film of alcohol (n=1.36) lies on a flat glass plate (n=1.51). The film thickness is unknown but is determined by some method to be less than 1000nm.
a) When monochromatic light with λ=512nm is incident generally, the reflected light is a MINIMUM, what are the possible thicknesses of the film?
b) When monochromatic light with λ=640nm is incident generally, the reflect light is a MAXIMUM, what are the possible thicknesses of the film?
c) If the reflected light is a MINIMUM for λ =512nmand at the same time a MAXIMUM for λ=640nm, what is the thickness of the film?