Which component focuses light onto the retina?

Which component focuses light onto the retina?

• A. The iris
• B. The retina
• C. The lens
• D. The cornea

Answer: (C)

The lens focuses light onto the retina and adjusts its shape to produce a sharp image at different distances. Light enters the eye and is bent mainly by the cornea, but the lens provides the fine-tuning needed to bring objects into clear focus on the retina. When you look at something far away, the lens becomes flatter; to focus on something up close, it thickens to increase its refractive power. The retina is where the light is detected, and the iris simply controls the amount of light entering by changing pupil size. So, the lens is the component that precisely focuses light onto the retina.

The lens focuses light onto the retina and adjusts its shape to produce a sharp image at different distances. Light enters the eye and is bent mainly by the cornea, but the lens provides the fine-tuning needed to bring objects into clear focus on the retina. When you look at something far away, the lens becomes flatter; to focus on something up close, it thickens to increase its refractive power. The retina is where the light is detected, and the iris simply controls the amount of light entering by changing pupil size. So, the lens is the component that precisely focuses light onto the retina.