The Rainbow is formed on sky when three conditions are fulfilled, they are; it should be either morning or evening,it should be raining in the drizzling form and at the same time the sun shine should be there.When Sun light is allowed to pass through prism it gets scattered to its constituent seven colors so to say violet,indigo blue, green, yellow,orange,and red.This is due to diffraction of light since light gets scattered when it pass through air medium to glass medium and again to air medium.Sun light suffers same changes that when rain drizzles each rain drop act as prism and it scatters sun light to its constituent seven colors and vibgyor is formed and it result as Rainbow over the sky.The Rainbow disappears when rain stops or sunshine fade away.
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