The soap film, which becomes forms

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The soap film, which becomes forms a wedge due to flow of the fluid. In the observation of the interference fringes of the reflected monochromatic light (lambda = 550 nm), it was found that the distance between the seven fringes l = 28 mm. Find the angle of the wedge. The light falls perpendicular to the surface of the film. The refractive index of soapy water n = 1,33.

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Task 40675. Detailed solution shorthand terms, formulas and laws used in the decision, the withdrawal of the calculation formula and the response.
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