試題詳解

46.To create a nonreflective coating for a camera lens, a film of index of refraction n₁ = 2.0 coats the surface of the lens, which has an index of refraction n₂ = 1.5. This coating leads to destructive interference for reflected monochromatic light of wavelength 600 nm in air. Assuming the light ray is incident on the film at nearly normal incidence, what could be the possible thickness of the coating film?
(A) 200 nm
(B) 300 nm
(C) 400 nm
(D) 500 nm
(E) 800 nm