Our discussion of the techniques for determining constructive and destructive interference by reflection from a thin film in air has been confined to...

Our discussion of the techniques for determining constructive and destructive interference by reflection from a thin film in air has been confined to rays striking the film at nearly normal incidence. Assume that a ray is incident at an angle of 30.0° (relative to the normal) on a film with an index of refraction 1.33. Calculate the minimum thickness for constructive interference of visible light with a wavelength of 595 nm