Monochromatic light of variable wavelength is incident normally on a thin sheet of plastic film in air. The reflected li

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Monochromatic light of variable wavelength is incident normally on a thin sheet of plastic film in air. The reflected li

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Monochromatic light of variable wavelength is incident normallyon a thin sheet of plastic film in air. The reflected light is amaximum only for 472.1 nm and 661.0 nm in thevisible spectrum. What is the minimum thickness of thefilm (n=1.58)? (Answer in nm)
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