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

Answer 1

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.