Does the shape of a rainbow have anything to do with the concave shaped back of a raindrop, from which the light is reflected?
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In some sense: yes. All is described by reflection and refaction in the raindrop. It is rather complex theory. Some description you have in Scientific American article: http://www.phys.uwosh.edu/rioux/genphysII/pdf/rainbows.pdf
answered Dec 24, 2017 at 8:56