Question

How many colours comprises white light?

A

infinite

B

seven

C

three

D

fourteen

Easy
Solution
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Correct option is B)

White light comprises of seven colours- Violet, Indigo, Blue. Green, Yellow, Orange , Red. 
So, when white light consisting  of seven colors falls on a transparent medium (glass prism) , each color in it is refracted ( or deviated ) by a different angle , with the result that seven colors are spread out to form a spectrum, The red color is deviated least , so it forms the upper part of the spectrum . On the other hand, violet color is deviated the maximum, so violet appears at the bottom of the spectrum.

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