A rainbow is an optical and meteorological phenomenon that is caused by reflection of light in water droplets in the Earth's atmosphere, resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured arc.Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.In a "primary rainbow", the arc shows red on the outer part and violet on the inner side. from Wikipedia (http://en.wikipedia.org/wiki/Rainbow)
A rainbow is an optical and meteorological phenomenon that is caused by reflection of light in water droplets in the Earth's atmosphere, resulting in a spectrum of light appearing in the sky. It takes the red arc. from Wikipedia (http://en.wikipedia.org/wiki/Rainbow)