The bow shape of a rainbow is a result of the way that light is refracted, or bent, as it enters and exits the water droplets in the air. When light enters a water droplet, it is refracted and dispersed into its different colors. These colors then reflect off the back of the droplet and are refracted again as they exit the droplet, creating the characteristic arc shape of the rainbow. This is because the angle at which the light exits the droplet depends on its wavelength (color), with shorter wavelengths (violet) refracting more than longer wavelengths (red). As a result, the colors are separated into an arc shape with red on the outside and violet on the inside.
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