Physics
19
The Eye
12
⚡ Quick Summary
The human eye is like a camera. Light enters through the cornea and lens, forming an image on the retina. The iris controls the amount of light entering, and the ciliary muscles adjust the lens to focus on objects at different distances.
N/A
- Cornea: Transparent protective membrane covering the front of the eye. Most of the bending of light happens here.
- Aqueous Humor: Liquid between the cornea and the lens, refractive index ~ 1.336.
- Iris: Muscular diaphragm that controls the size of the pupil.
- Pupil: Hole in the iris that allows light to enter the eye.
- Lens: Crystalline lens that focuses light onto the retina, refractive index ~ 1.396 (average).
- Ciliary Muscles: Muscles that adjust the shape and focal length of the lens.
- Vitreous Humor: Liquid filling the space between the lens and the retina, refractive index ~ 1.336.
- Retina: Light-sensitive layer at the back of the eye containing rods and cones (receptors) and optic nerve fibres. Image is formed here.
- Accommodation: The process of adjusting the focal length of the eye-lens by the ciliary muscles to focus on objects at different distances.