Answer :

Dispersion is the natural phenomenon by which white light is split into seven constituent colours. The band of the seven colours obtained from the splitting of white light is called spectrum. All the constituents of white light travelling in vacuum they have the same velocity but when they pass through a transparent medium their velocity changes and they tend to deviate.


Fig. Dispersion of white light by a prism


The colour spectrum obtained from the dispersion of white light are:


Ø V – Violet


Ø I – Indigo


Ø B – Blue


Ø G – Green


Ø Y – Yellow


Ø O – Orange


Ø R - Red


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