I always think this is a thing we just take like it is, but how actually does it work? I’ve had this question a long time and none could give me a proper answer.
[Sorry for spelling, english second language]
In: Physics
Trace a beam of light from every object you can see to your eyes. Your eyes are small enough that we can think of them as just being a single point, and if we do, we can see that space or shape traced out by all the beams of light from every object you can see to your eyes forms a cone, with your eyes at the pointy bit. This is your field of vision, and because it’s a cone we can measure it as an angle. Something of a certain size occupies a certain amount of this angle in your field of view, but if you move closer, it takes up a larger angle, making it seem relatively bigger than it was when you were far away. It’s the same reason that the shadow of an object close to a light source is bigger than the same object farther away from a light source, it’s just the geometry of angles and cones at work
You could imagine eyes that worked like the opposite of a laser, only allowing in beams of light perfectly perpendicular to the eye. The field of vision would be a cylinder instead of a cone, and all objects would appear the same size at every distance, because they would always occupy the same angle in the field of view. But these eyes would be kind of useless, because the field of view would be limited to the actual diameter of the eyes, not really good for anything
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