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Answer :

(i) The name of the phenomenon is Dispersion. The phenomenon of splitting of white light into its components colors while passing through a prism is known as Dispersion of light. The angle of refraction is different for different components of white light because of difference in speed of light when travelling through the medium. This results in the refraction of different colors of the light at different angles and thus results in formation of the spectrum.

(ii)This phenomenon of dispersion is observed when a rainbow is formed.

(iii)The conclusion which can be drawn from the constituents of white light is that white is light is composed of seven colors which are: Red, Orange, Yellow, Green, Blue, Indigo and White.

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