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# What is a spectrum? Why do we get a spectrum of seven colours when white light is dispersed by a prism?

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#### The band of seven colors obtained, when a white light splits into its constituent colors on striking the surface of glass prism is called as a spectrum. A beam of white light splits into the spectrum of seven colors when it is passed through a prism because of the difference in the angle of refraction of different colors.

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Similar Questions
Q1
What is a spectrum? Why do we get a spectrum of seven colours when white light is dispersed by a prism?
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Q2
Draw a diagram to show how white light can be dispersed into a spectrum by using a glass prism. Mark the various colours of the spectrum.
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Q3
Why do the component colours of incidet white light split into a spectrum while passing through a glass prism?
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Q4

A ray of white light is passed through a glass prism and spectrum is obtained on a screen.

(a) Name the seven colours of the spectrum in order.

(b) Do the colours have the same width in the spectrum ?

(c) Which of the colour of the spectrum of white light deviates (i) the most, (ii) the least ?

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Q5
When white light splits in seven colours, the phenomenon is called spectrum.
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