The phenomenon not involved in the formation of a rainbow is_

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Refraction.

Dispersion.

Scattering.

Internal reflection.

answer is C.

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Detailed Solution

Out of the given options, scattering is not responsible for the formation of the rainbow.
A rainbow is caused by refraction, dispersion, and complete internal reflection of sunlight by water droplets suspended in the air. These tiny water droplets act as a prism after rainfall for the sunlight.
The sunlight gets refracted and dispersed into its seven colours, entering through a droplet. Then these light rays are subjected to the total internal reflection (complete reflection of a ray of light within a medium from the surrounding surfaces back into the medium).
Hence, rainbow formation is the resultant effect of the refraction, dispersion, and total internal reflection of light through the water droplets.

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