A smooth glass plate of refractive index 1.50 is coated with a smooth thin film of thickness 360 nm and refractive index 1.30. Light in air is incident on the film at normal incidence. Find the wavelengths in the visible region (400 - 700 nm) that undergo interference in the reflected light which are: a) completely destructive (anti-reflecting) and b) completely constructive (strongly reflecting)