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When white light is reflected at perpendicular incidence from a soap film suspended in air, within the visible spectrum, it results in a constructive interference at a wavelength, λ = 600 nm, and a destructive interference at λ = 450 nm, with no other maxima or minima in between. Given that the refractive index of the film is n = 1.33, the question becomes: What is the thickness of the film?

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