The rays of different colours fail to converge at a point after going through a converging lens. This defect is called

Options

A. chromatic aberration
B. coma effect
C. distortion
D. spherical aberration

Answer

A

Explanation

Focal length of the lens depends on refractive index of material and refractive index of material is slightly different for different colours. That is why different colours show different focal length and this defect is called chromatic aberration because we know that it is related to the colour. Hence, option (a) is correct.