Dispersion Of Light
Cause of Dispersion of Light
The cause of dispersion of light is that white light consists of seven different colours, and each colour has different angle of deviation. Therefore, on passing through the prism different colours deviate through different angles. Hence the seven colours of white light separates and form a spectrum. Out of seven colours, the red colour deviates the least, and hence the red colour is present at the top of the spectrum. On the other hand, the violet colour deviates most that is why violet colour is present at the lower end of the spectrum.
Formation of Rainbow
The formation of rainbow is based on the process of dispersion of light. It is the most enchanting example of dispersion of light which takes place naturally. Usually a rainbow of seven colours is seen in the sky just after the rain when the Sun is shining. The essential condition to see the rainbow is that the observer must stand with his back towards the sun, when seeing the rainbow. Actually after the rain, a large number of water droplets remain suspended in the atmosphere. These droplets of water function as small prisms. So, when the white light emitted by Sun falls on these water droplets, then the white light is split into seven colours and rainbow is formed.