Name: Primary Colours of Light
Uploaded: 2019-07-19
Duration: 5 min 33 s
Description: Did you know that certain colours are more important than the others? Also, certain colours can be derived using the others! This video explains why.

Question

A narrow beam of white light enters a glass prism and it splits into the colours of the visible spectrum. The lines labelled A to G represent rays of seven main colours of the visible spectrum. Write down the letter that corresponds to the YELLOW ray.

Question Image

Accepted Answer

When white light is passed through a glass prism it splits into its spectrum of 7 colours (in order violet, indigo, blue, green, yellow, orange and red) and this process of white light splitting into its constituent colours is termed as dispersion.

When white light is made to pass through a prism, a spectrum of seven colours is formed which shows that white light is a mixture of seven different colours. Prism only acts as a medium for the separation of the seven colours. When light falls on the glass prism, refraction takes place. Since the wavelength of different components of light is different and the frequency is constant, each component gets deviated by a different angle due to the difference in velocity in the glass medium. The red colour having the maximum wavelength deviates the least and forms the upper part of the spectrum whereas violet having the least wavelength deviates the most.

Hence, YELLOW ray is represented by $C$ .

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