Concept:A convex lens is a converging lens that bends light rays inward so the image can be focused clearly on the retina.
Explanation:In some eye defects, such as long-sightedness, the eye does not converge light rays strongly enough.
As a result, the image would form behind the retina instead of on it.
A convex lens adds extra convergence to the light rays.
Light rays from far objects enter as parallel rays and are refracted inward by the convex lens.
This brings the point of focus forward so that the image falls exactly on the retina.
Therefore, the main function of the convex lens is to converge the rays and form a clear image on the retina.
Answer:D. converge light rays from far objects to focus their image on the retina