Rainbows are nice to watch. How exactly is a rainbow formed? Well, rainbows are formed when sunlight falling on raindrops is split into different colours of the spectrum of light. As you can see, sunlight is really a mixture of all the colours of spectrum which are, red, orange, yellow, green, blued, indigo, and violet. Usually our eyes sees the sunlight as an ordinary light.
When that light passes at an angle through a curved transparent surface, like a raindrop, the beam is bent in different amounts, so the light is split into the colours of the spectrum.
This can also occur when a light passes through a piece of glass cut at different angles.
Source : http://www.xomba.com/how_are_rainbows_formed
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