Why does the camera display a reduced image?

The principle of photography is actually the same as that of people looking at objects.

The eyes are the lens of a camera. The brain that people feel objects and remember their shapes is just like the film in a camera or the photosensitive element in a digital camera, and the object is the same as the subject of a camera.

There are three points from the object to the eye (lens) and then to the brain (film/photosensitive element). We draw two lines from the top and bottom of the object, which pass through the eyes and extend to the brain respectively, so that we can clearly see that the top of the object becomes the bottom of the brain, and the bottom of the object becomes the top of the brain, also called inverted image.

When we look at the distance arrangement of three points, the distance from the eye to the object is always long, while the distance from the brain to the eye is short, which means that the image is always smaller than the image of the object.

I wonder if you can understand this answer. !