If you have a thin film of thickness 300 nm, what is the third-longest wavelength (λ3,constructive) of light that exhibits constructive interference with the reflected light, corresponding to m=3?
A) λ3,constructive = 150 nm.
B) λ3,constructive = 100 nm.
C) λ3,constructive = 200 nm.
D) λ3,constructive = 75 nm.
