Question

Which colour has minimum deviation in the spectrum of white light?
A) Red
B) Yellow
C) Violet
D) Blue

Answer 1

Hint
Spectrum of white is formed by passing white light from a glass prism. This phenomenon is known as dispersion of white light. White light is composed of different colours light or light of different wavelength i.e. VIBGYOR pattern. Deviation of light is inversely proportional to wavelength of light.

Complete step by step solution
White light is composed of different colours light or light of different wavelength i.e. VIBGYOR pattern. In these colours, red has maximum wavelength and violet has minimum wavelength.
We know deviation of light is inversely proportional to wavelength of light. Then colour with more wavelength deviates less and colour with less wavelength deviates more.
Or we can say that deviation of red colour is minimum and deviation of violet colour is maximum.
Hence the correct answer is option (A).

Note
As we see in the spectrum of white light red colour is at top and violet colour is at bottom because red colour deviates least and violet colour deviates more. Dispersion of light happens due to the difference in wavelength of colours. When we incident the spectrum of white light on prism then, its reverse its effect and we get white light again. Rainbow is another example of spectrum of white light which occurs due to dispersion of white light by water droplets in the atmosphere.