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This is an example of thin-film interference. Oil on the pavement floats to the water's surface, forming an extremely thin film. Light waves reflected from the front and back surfaces of the film interfere, amplifying a particular light wavelength (color) for each particular film thickness. The rainbow pattern is formed by gradual changes in film thickness across the puddle surface.

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Q: Why a Puddle of water shows with a rainbow effect on pavement?
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