A rectangular wire frame is immersed in soapy water, causing a soapy film to form on it. When observed in reflected light, the angle of incidence of which is a = 30°, the film appears green (l0 = 500 nm). The dimensions of the sides of the frame are a = 0.020 m and b = 0.30 m. The density of the soap solution is p = 103 kg/m3, the refractive index of the film is n = 1.33. Complete the following tasks and answer the questions: 1. Is it possible to find the mass of this film using a balance whose sensitivity is 0.1 mg? 2. What color will the thinnest film that satisfies the problem appear if light falls on it and then reflects perpendicular to the film?
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