Final answer:
The human eye focuses incoming light through the cornea, pupil, lens, and finally onto the retina, which has rods and cones to sense light and color. Underwater vision is blurry due to refractive differences, corrected by a face mask that creates an air space for normal refraction.
Step-by-step explanation:
The human eye is a sophisticated system that senses and focuses light to provide vision. When light enters the eye, the following steps occur:
- Light first passes through the cornea, which is the clear, protective outer layer of the eye. This structure refracts the light and assists with eye protection.
- Next, light travels through the pupil, the black opening within the iris that controls the amount of light entering the eye.
- The light then strikes the lens of the eye, which further fine-tunes the focus.
- Finally, the focused light reaches the retina, which has two types of cells, rods and cones, responsible for sensing low light and color vision respectively. The retina converts the light into neural signals that are sent to the brain.
Vision blur while underwater without goggles is due to the refractive index of water altering the light path and the eye's inability to compensate. A face mask corrects this by creating an air space in front of the eyes, allowing normal refraction to occur.