<P> A rainbow is a meteorological phenomenon that 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 . Rainbows caused by sunlight always appear in the section of sky directly opposite the sun . </P> <P> Rainbows can be full circles . However, the observer normally sees only an arc formed by illuminated droplets above the ground, and centered on a line from the sun to the observer's eye . </P>

Where do the colours of the rainbow come from
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