Question

Arrange the following coloured light rays in increasing order of the angle of deviation, when passed through a prism.

• A. Red
• B. Violet
• C. Orange
• D. Blue
• E. Green

Answer 1

When white light is passed through a prism, it gets separated into its component colours - red, orange, yellow, green, blue and violet - in a phenomenon called dispersion. Red light bends the least because of its larger wavelength, and violet bends the most due to its smaller wavelength. The angle of deviation (bending) is, hence, in the order: $\text{Red}<\text{Orange}<\text{Green}$$<\text{Blue}<\text{Violet}$.