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Explain the formation of a rainbow....

Explain the formation of a rainbow.

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Figure shows how sun light is broken into its segments in the process and a rainbow appears. The dispresion of the violet and the red rays after internal reflection in the drop is shown in figure.
The red rays emerge from the drops of water at one angle `(43^(@))` and the violet rays emerge at another angle`(41^(@))`. The large number of water drops in the sky makes a rainbow. The rainbow appears semicircular for an observer on earth.
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