Question: Monochromatic light of variable wavelength is incident normally on a thin sheet of plastic film in air. The reflected light is a minimum only for

Monochromatic light of variable wavelength is incident normally on a thin sheet of plastic film in air. The reflected light is a minimum only for λ = 512nm, and λ 640nm in the visible spectrum. What is the thickness of the film (n = 1.58)?

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