Question

How many colours are present in the rainbows?
A. 5
B. 6
C. 7
D. 8

Answer 1

Hint:
The above problem can be resolved using the knowledge of the phenomena of the dispersion of light rays coming from the sun. The white light gives out the combination of seven colours on the spectrum that are collectively known as VIBGYOR. Moreover, each coloured light ray has its specific wavelength and the frequency in their atomic spectra. This spectrum is known as the spectrum of white light, and the combination of all the colours can be visible, to which we generally designated the rainbow.

Complete step by step answer:
The rainbows are formed by the dispersion phenomena of white light or the radiation coming from the sun. The rainbow consists of the composition of seven colours generally known as VIBGYOR.
Each one of these have its usual meaning and is given as,
V – Violet
I – Indigo
B – Blue
G – Green
Y – Yellow
O – Orange
R – Red
Therefore, the colours present in the rainbow is 7 and option ( C ) is correct.

Note: Try to understand the phenomena of dispersion and the concept behind the formation of the rainbow. When the light rays coming from the sun get interacted with the molecules of water vapour, then these light rays get split into the seven colours. And these seven colours form a ribbon known as the rainbow, and this phenomenon is known as the dispersion. The dispersion has its critical application in various fields of optics.