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The Rainbow is a freak of nature. But the explanation of why it occurs is quite complex and not often found in elementary physics books. Typically, you see only a bow, but sometimes there are two, one more intense than the other. This article gives several explanations of why the Rainbow. A according to Aristotle, another supernumerary arcs according to Young, and the last by Airy, based on the knowledge to be had on the properties of waves at the time.

El Arco Iris, ¿Es un tratado de física?