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Soap film
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== Colours == [[File:thinfilmbubble.jpg|thumb|left|Figure 3: thin film interference in a soap bubble. Notice the golden yellow colour near the top where the film is thin and a few even thinner black spots]] The [[iridescence|iridescent]] colours of a soap film are caused by [[Interference (wave propagation)|interfering]] of (internally and externally) reflected light waves, a process called [[Thin-film interference|thin film interference]] and are determined by the thickness of the film. This phenomenon is not the same as the origin of [[rainbow]] colours (caused by the [[refraction]] of internally reflected light), but rather is the same as the phenomenon causing the colours in an oil slick on a wet road.
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