Where is light focused after passing through the cornea and lens?

• A. Retina
• B. Cornea
• C. Iris
• D. Optic nerve

Answer: (A)

Light is focused on the retina after passing through the cornea and lens. The cornea does most of the bending of light, while the lens changes shape to fine-tune focus for objects at different distances (accommodation). When the light rays converge properly, they form a sharp image on the retina, the light-sensitive layer at the back of the eye. The retina’s photoreceptors (rods and cones) then convert light into neural signals that travel to the brain via the optic nerve. The iris merely controls how much light enters by adjusting the pupil size, and the optic nerve carries the signals to the brain rather than focusing light.