申論題

(2) (20 points)

(b) (14 points) A thin film of thickness 500 nm is placed in vacuum. A visible light source with wavelengths from 360 nm to 720 nm is incident normally on the thin fim and found that 400 nm and 600 nm are missing in the relected light. Find the minimum possible refractive index of the thin flm. For this refractive index, what wavelengths are reilected most strongly from the thin flm? What wavelengths are transmitted most strongly through the thin film?