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What is a spectrum ? Why do we get a spe...

What is a spectrum ? Why do we get a spectrum of seven when while light is dispersed by a prism ?
OR
Explain how a spectrum is formed.

Text Solution

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A band of coloured components of a light beam is called a spectrum .
When white light is incident on a prism, the rays corresponding to different colours bend through different angles on refraction .
Of the various colours in the visible region, red light bends the least and violet light bends the most. Each colour emerges through the prism along a different path and becomes distinct. Hence, we get a spectrum of seven colours.
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