Ray convergence in the emmetropic eye

Steps:

• Light rays from a distant object enter the eye as parallel beams.
• The cornea and lens refract these rays to converge at a single point.
• In a normal eye, this focal point lies directly on the retina.
• The diagram matching this process shows clear image formation.

Why A is correct:

• Diagram A depicts parallel rays from infinity converging precisely on the retina, per the lens formula (1/f = 1/v - 1/u) where u is infinite, so v equals focal length.

Why the others are wrong:

• B shows rays diverging after the lens, indicating myopia with focus in front of retina.
• C shows rays converging behind the retina, indicating hyperopia.
• D shows unfocused scattered rays, failing to form a clear image.

Final answer: A