Final answer:
The structures that focus light as it passes through the eye are the cornea, which has a fixed focus, and the flexible lens, which can change shape to focus on objects at different distances. The correct answer to the question is A. cornea...lens.
Step-by-step explanation:
As light passes through the eye it is focused by the cornea, which always focuses light in the same way, and the lens, which is flexible and enables focusing on objects at different distances by varying its thickness. So the correct answer is A. cornea...lens.
The cornea is the eye's outermost layer. It functions like a window that controls and focuses the entry of light into the eye. The cornea contributes to the eye's overall optical power and its ability to focus on objects at various distances, although it doesn't change shape.
The lens, situated just behind the iris and pupil, adjusts its shape to focus light on the retina, which allows us to see things clearly both up close and far away. This flexibility in the lens, known as accommodation, is crucial for maintaining a sharp image on the retina.