Question

Chromatic aberration(distance between the focal lengths for extreme wavelengths) of a convex lens can be reduced by(Assume lenses are kept in vacuum)

• A. Adding a concave lens
• B. Adding a convex lens
• C. Decreasing focal length by squeezing it
• D. Decreasing aperture without changing it curvature

Answer 1

The correct option is D Decreasing aperture without changing it curvature

It can be reduced by "Decreasing aperture without changing it curvature"
option $D$ is correct