Лаг1989 задача №20.33

A beam of white light falls normally onto a glass plate, the thickness of which is d = 0.4 µm. Refractive index of glass n = 1.5. What wavelengths λ lying within the visible spectrum (from 4 · 10⁻⁴ to 7 · 10⁻⁴ mm) are amplified in the reflected beam?

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