2. What do human eyes and brains use to figure out things about a space?

If the object distance is changed, the image distance (the distance between the lens and the film) is adjusted by moving the lens. With a camera, the lens has a fixed focal length.

This process of adjustment is known as accommodation. The lens is critical in forming a sharp image, however this is one of the most amazing features of the human eye, that it can adjust so quickly when focusing objects at different distances. Light is refracted when it comes into the eye by this liquid, refracted a little more by the lens, and then a bit more by the vitreous humor, the jelly-like substance that fills the space between the lens and the retina. The way the eye focuses light is interesting, because most of the refraction that takes place is not done by the lens itself, but by the aqueous humor, a liquid on top of the lens. In a camera, film is used to record the image in the eye, the image is focused on the retina, and a system of rods and cones is the front end of an image-processing system that converts the image to electrical impulses and sends the information along the optic nerve to the brain. a lens to focus the light and create an image.This is the shutter in a camera, and the pupil, at the center of the iris, in the human eye. a diaphragm to control the amount of light that gets through to the lens.There are many similarities between the human eye and a camera, including: The human eye is a wonderful instrument, relying on refraction and lenses to form images.

2. What do human eyes and brains use to figure out things about a space?