The structure that sits behind the pupil and bends the light rays that enter the eye to focus images on the retina is the

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In addressing the question about which structure behind the pupil focuses light onto the retina, I will evaluate each option.
Option 1: cornea. While the cornea does bend light and contributes to the eye’s overall focusing power, it sits at the very front of the eye, not behind the pupil, and its role is more about the initial entry of light rather than the fine focusing required to form a sharp image on the retina.
Option 2: iris. The iris controls the size of the pupil and regulates how much light enters the eye, but it does not bend or focus light to form the image on the retina. Its function is more about light adjustment, not image formation.
Option 3: optic nerve. The optic nerve transmits visual information from the retina to the brain. It is involved in processing and pathways of vision, but it does not participate in bending or focusing light to create an image on the retina itself.
Option 4: lens. The lens is the flexible, transparent structure located behind the pupil that changes shape to adjust focus, bending light rays so that they converge onto the retina to create a clear image. This property directly aligns with the description of focusing images on the retina.
Putting these observations together, the description matches the role of the lens, which fine-tunes focus by bending light as it passes through, enabling sharp retinal images.

The structure that sits behind the pupil and bends the light rays that enter the eye to focus images on the retina is the

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