Film to look dark in reflected light

Reference no: EM13660770

A soap fil (n=1.33) is 465 nm thick and lies on a glass plate (n=1.52). Sunlight, whose wavelengths (in vacuum) extend from 380 to 750 nm, travels during air and strikes the film perpendicularly. For which wavelength(s) in this range does destructive interference because the film to look dark in reflected light?

Reference no: EM13660770

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