We all know that rainbows are one of the unique phenomena where one can see the constituents of light naturally (It’s not always all the colours that are visible). Well, we all would have probably done this experiment at our school levels, that when we pass the beam of white light through a prism, we could see the seven constituent colours commonly known as the VIBGYOR. The principle behind the phenomenon is series of refractions of the light beam. Ever wondered how this happens in the atmosphere? In the absence of the prism? Well, the answer is simple, here, series of refractions do occur. But the surfaces are different. Here,it is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured circular arc. This is caused by light getting refracted when it enters a rain water droplet, then reflected inside on the back of the droplet and refracted again when leaving it. Rainbows are formed in the section of sky which is directly opposite to the sun.
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