Dark or light will be in reflected monochromatic

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Soap film (n = 4/3) with a thickness of d = 3.375 μm with normal incidence of rays with a wavelength of 600 nm will be dark or light in reflected monochromatic light. There must be a drawing for this task.
Task 40517. A detailed solution with a brief record of the conditions, formulas and laws used in the solution, the derivation of the calculation formula and the answer.
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