Question

White light is composed of ______ colours. The colour of white light deviated through the largest angle by a prism is ______.

Answer 1

White light is composed of seven colours. The colour of white light deviated through the largest angle by a prism is violet.

Explanation:

When white light enters a prism, its constituent colours split because each colour travels at a different speed through glass. Violet light slows down the most and has the shortest wavelength, causing it to bend (deviate) the most. Conversely, red light slows down the least and has the longest wavelength, resulting in the least amount of deviation.