Explain the formation of rainbow in the sky with the help of diagram. List the tree phenomena involved in proper sequence.
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Rainbow is formed due to following reasons:Refraction, Dispersion of white light , total internal reflection.Essential condition for formation of rainbow:1. Presence of raindrops2. To view rainbow, sun should be at your back.Formation:The rays of sunlight, enter the drop near its top surface. At first refraction occurs , then white light is split up into & colours , violet most deviated and red least.Reaching the opposite side of drop each colour is refracted back into the drop because of total internal reflectionarriving at the surface of the drop , each colour is again refracted into air.We observe the rainbow when we view in between 42-20 degrees.
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