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2014-08-14T21:03:02+05:30
Refraction of light is responsible for this.
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2014-08-14T21:13:09+05:30

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After the rain a number of small droplets of water remain suspended in the air. Each drop acts as a small prism. When sunlight falls on these drops the white light spills into seven colours. The dispersed light from a large number of drops forms a continuous band of seven colours. 
This coloured band is called a RAINBOW.
Thus this phenomena depends on Refraction and Dispersion of Light.
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