When light passes into the eye, what is it focused by? Is it the cornea and pupil or the retina and cornea? Please help thankss
The cornea is the focus unit and it focuses the image on the retina. The pupil doesn't focus; it lets the light in and changes in diameter to accommodate the amount of light needed.
When light enters the eye, it is primarily focused by the cornea and the lens. The cornea is the transparent, outermost layer that acts as a protective covering for the eye. It refracts (bends) light as it enters the eye. The lens, located behind the pupil, further refracts the light to ensure that it is properly focused onto the retina.
The retina, on the other hand, is the layer at the back of the eye that contains light-sensitive cells called photoreceptors. These cells detect and convert light into electrical signals that are then transmitted to the brain for visual processing.
So, in summary, the cornea and lens work together to focus incoming light onto the retina, while the retina plays a key role in capturing and transmitting visual information to the brain.