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Question
In the following diagram showing dispersion of white light by a glass prism, the colours 'P' and 'Q’ respectively are:
Options
Red and Violet
Violet and Red
Red and Blue
Orange and Green
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Solution
Violet and Red
Explanation:
The splitting of white light into its constituent colours is known as light dispersion. The spectrum is the band of seven colours produced by splitting white light. All of the constituent colours of white light have the same velocity in vacuum, but their velocity changes when they pass through a transparent 'medium' like a glass prism. Different colours are diverted by different angles on the prism's initial face. Violet's minimum speed is deviated by the maximum angle, whereas red's maximum speed is distorted by the minimum angle. As a result, the letters 'P' and 'Q' are violet and crimson, respectively.
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