Question

Which of the following colours of light undergoes the least deviation while passing through a glass prism ?
(A) Red
(B) Blue
(C) Yellow
(D) Green

Answer 1

Hint: When a glass prism penetrates visible light from the right, it is refracted and divided into a spectrum of visible colors. Each beam of light is slowed differently by the glass, with its own unique wavelength (or color). Since violet light has a shorter wavelength, it slows down more than red light's longer wavelengths. Consequently, through red light is bent the least, violet light is bent the most.
This separation of white light into its different colours is referred to as light dispersion.

Complete Step by step solution:
The light that has more wavelengths will spread less and have less dispersion. When white light is dispersed from the prism, the red colour will deviate the least and violet will deviate the most. Light with a better match travels more slowly through the material and thus appears to be deflected more.

Correct answer is A

Note:
Angle of deviation increases with the increase in the angle of prism. The prism with a higher refractive index produces a greater deviation than the prism which has a lower refractive index. White light passing through a prism is distributed through its component colors in the prism medium that have different wavelengths. Of all these wavelengths in the visible spectrum, the one that corresponds to the color of red is the least deviated. The red light wavelength is the shortest, but when passing through the medium it has the greatest velocity. so it passes without facing much variance, while the other colors of larger wavelengths are bent to a greater degree. The dispersion of white light happens because the angle of refraction of lights of different colours is different while passing through the transparent medium