The lens focuses

The lens focuses

• A. Iris
• B. Light
• C. Cornea
• D. Pupil

Answer: (B)

The lens focuses light onto the retina. It does this by changing its shape through accommodation, allowing nearby or distant objects to be brought into sharp focus. While the cornea contributes most of the eye’s refractive power, the lens provides the adjustable refinement that ensures the final image lands precisely on the retina. The iris merely controls the amount of light entering by changing pupil size, and the pupil is simply the opening through which light passes—so neither directly focuses the image. That combination makes the lens the correct choice for how focus is achieved.

The lens focuses light onto the retina. It does this by changing its shape through accommodation, allowing nearby or distant objects to be brought into sharp focus. While the cornea contributes most of the eye’s refractive power, the lens provides the adjustable refinement that ensures the final image lands precisely on the retina. The iris merely controls the amount of light entering by changing pupil size, and the pupil is simply the opening through which light passes—so neither directly focuses the image. That combination makes the lens the correct choice for how focus is achieved.