This is a really good question. I like it a lot, but it might get somewhat confusing so bear with me. When light passes through a water droplet, it bends. The resulting color depends upon the wavelength. Each color also has a different angle with which it bends, so the colors that are evident in a rainbow will be on top of each other. Because of their different angles, the colors create the shape of an arc. The links below might do a better job describing it than I can.
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