Concept:Chromatic aberration is corrected by combining a converging lens with a diverging lens of suitable focal lengths.
Explanation:When white light passes through a single lens, different colours are refracted by different amounts.
This causes the coloured rays to focus at different points, producing colour fringes.
A converging (convex) lens alone increases this spreading of colours.
By combining a converging lens with a diverging (concave) lens, the dispersion caused by one lens is neutralised by the other.
The combination brings the different colours to a common focus, forming a sharper image.
Therefore, chromatic aberration is corrected using a combination of diverging and converging lenses.
Answer:Option A — diverging and converging lenses.