English: Live on the 9th of December, 2013. Buda hills, Budapest, Hungary. Here we see a rainbow as photographed from Sashegy, elevation Nr.3. It had happened when the sun highlighted the foggy backround over Buda. Produced by sunlight shining through atmospheric ice crystals. If there is moisture in the air, sunlight may hit water droplets as it enters the atmosphere. When this happens, the light enters the water drop and becomes refracted, meaning that its course is slightly altered. The degree to which the course is altered depends on the light's wavelength. Since sunshine contains all the wavelengths (and, therefore, all colors), when it hits the water drop, each wavelength is refracted at a slightly different angle causing the colors to fan out slightly. The waves continue through the drop until they hit the far side where they are reflected. While refraction diverts the light, reflection bounces it back, sending it in the same general direction from which it came. The waves pass back through the front side of the droplet where they are refracted again, spreading the colors further before they pass back out into the sky.

Sources: http://www.mnn.com/local-reports/wyoming/local-blog/the-science-behind-a-double-rainbow

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