Concept explainers
The reason behind variety of colors is seen in gasoline splotches on wet street.
Explanation of Solution
A variety of colors is seen in gasoline splotches on wet streets that occur due to the interference of light reflected from inside as well as outside the surfaces. When a color is canceled, its complementary colors are observed. This occurs in gasoline on a wet street also. Light reflects from two surfaces. One is the upper, air-gasoline surface. The other is the lower gasoline-water surface.
Since the film thickness is not uniform, different film thickness shows a contour map of microscopic differences in surface elevation.
Conclusion:
Therefore, a variety of colors are seen in gasoline splotches on wet street is due to the non uniform thickness of the film which results in showing a contour map of microscopic differences in surface elevations.
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