When sunlight reflects from a thin film of soapy water
Chapter 27, Problem 27.17(choose chapter or problem)
When sunlight reflects from a thin film of soapy water (air on both sides), the film appears multicolored, in part because destructive interference removes different wavelengths from the light reflected at different places, depending on the thickness of the film. What happens as the film becomes thinner and thinner? (a) Nothing happens, and the film remains multicolored. (b) The film looks brighter and brighter in reflected light, appearing totally white just before it breaks. (c) The film looks darker and darker in reflected light, appearing black just before it breaks.
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