How much does the film differ in thickness over the distance

Reference no: EM13539190

A soap film formed in a loop of wire is, because of its weight, not exactly uniform in thickness, but wedge-shaped in cross section. When the film is illuminated with 546 nm light, one sees four interference fringes spread over a distance of 2.0 cm of the film. By how much does the film differ in thickness over the distance?

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Reference no: EM13539190

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