Q1. When a narrow beam of sunlight is incident on a glass prism, the emergent light is seen to consist of seven colours. In the emergent light:
A the violet light bends the most, while the red light bends the least. Correct
B the red light bends the most, while the violet light bends the least.
C both the violet light and the red light bend equally.
D bending of the light beam does not occur.
Explanation
In a glass prism, dispersion occurs because different colours travel with different refractive indices. Violet light has a shorter wavelength and is refracted more strongly, so it bends the most. Red light has a longer wavelength and is refracted less, so it bends the least. Saying that red bends the most reverses the actual order. Equal bending would mean no dispersion into seven colours. Saying that no bending occurs ignores refraction through the prism itself.