Question

6. A beam of white light forming a spectrum.
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Answer 1

Spectrum of white light: The band of seven colours formed when a beam of white light is passes through a glass prism is called spectrum of white light. Dispersion of light: The splitting of white light into seven colours on passing through a transparent medium is called dispersion of light.

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Answer 2

Explanation:

A spectrum is obtained by sending a beam of white light through a prism. A second prism exactly similar to the first one is placed in an inverted position with the sides parallel to the first. Now the previous spectrum will disappear and we will obtain a white light formed by the fusion of the colours.

As white is composed of seven colors. The seven colors together joins to form white light again.