which path does light take upon entering your eye?
a). cornea-pupil-iris-retina-lens-optic nerve-brain
b). pupil-cornea-iris-lens-retina-optic nerve-brain
c). cornea-pupil-lens-retina-optic nerve-brain
Light does not go through the iris.
The correct answer is option C: cornea-pupil-lens-retina-optic nerve-brain.
To understand why this is the correct sequence, let's break it down step by step:
1. Cornea: When light enters the eye, it first encounters the transparent outer covering called the cornea. The cornea helps to focus or bend the light rays.
2. Pupil: After passing through the cornea, the light continues into the pupil. The pupil is the dark circular opening at the center of the iris. It controls the amount of light that enters the eye by contracting or dilating.
3. Lens: Once the light passes through the pupil, it reaches the lens. The lens further refracts or bends the light, focusing it more precisely onto the retina.
4. Retina: The focused light now reaches the retina, which is the innermost layer at the back of the eye. The retina contains light-sensitive cells called rods and cones, which convert the light into electrical signals.
5. Optic Nerve: The electrical signals generated by the retina are then transmitted to the brain through a bundle of millions of nerve fibers called the optic nerve. The optic nerve carries the visual information to the visual cortex in the brain.
6. Brain: Finally, the visual cortex in the brain processes the electrical signals received from the optic nerve, allowing us to perceive and interpret the visual information as the images we see.
Therefore, the correct sequence of how light enters the eye is cornea-pupil-lens-retina-optic nerve-brain.