Задача 40517.

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.

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.
If you have questions about the solution, write. I will try to help.