Ray convergence in the eye for distant vision

Steps:

• Light rays from a distant object enter the eye as parallel beams due to infinite distance.
• The convex lens of the eye refracts these parallel rays to converge at a single point.
• In normal vision, this focal point lies exactly on the retina.
• The correct diagram illustrates parallel incoming rays focusing sharply on the retina without distortion.

Why A is correct:

• Diagram A depicts parallel rays from infinity converging precisely on the retina, aligning with the lens formula $\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$ where is infinite, so , the focal length.

Why the others are wrong:

• B shows diverging rays, incorrect for distant objects which produce parallel light.
• C illustrates focus in front of the retina, typical of hyperopia, not clear vision.
• D depicts blurred convergence behind the retina, as in myopia for distant objects.

Final answer: A