Before light rays focus on the retina, they must pass through the eye in which order?

Before light rays focus on the retina, they must pass through the eye in which order?

• A. Pupil, cornea, lens, vitreous humor
• B. Cornea, lens, pupil, vitreous humor
• C. Cornea, pupil, lens, vitreous humor
• D. Cornea, iris, lens, retina

Answer: (C)

This question tests the path light takes as it enters and travels through the eye to reach the retina. Light first encounters the cornea, the clear front surface that provides most of the eye’s focusing. After passing through the cornea, light goes through the pupil—the opening in the iris that adjusts to control how much light enters. It then reaches the lens, which can change shape to fine-tune focus for near or far objects. Finally, light travels through the vitreous humor, a clear gel that fills the eye’s main cavity and helps guide light to the retina, where photoreceptors convert it into signals for the brain. The sequence that matches this flow from outside to inside is cornea, pupil, lens, vitreous humor. The other options mix up the order or replace the pupil with the iris, which isn’t a passage light travels through—the opening itself is the pupil.

This question tests the path light takes as it enters and travels through the eye to reach the retina. Light first encounters the cornea, the clear front surface that provides most of the eye’s focusing. After passing through the cornea, light goes through the pupil—the opening in the iris that adjusts to control how much light enters. It then reaches the lens, which can change shape to fine-tune focus for near or far objects. Finally, light travels through the vitreous humor, a clear gel that fills the eye’s main cavity and helps guide light to the retina, where photoreceptors convert it into signals for the brain.

The sequence that matches this flow from outside to inside is cornea, pupil, lens, vitreous humor. The other options mix up the order or replace the pupil with the iris, which isn’t a passage light travels through—the opening itself is the pupil.