eli5 why distance objects appear smaller, and why not only blurrier while size is the same for the naked eye.

Question

eli5 why distance objects appear smaller, and why not only blurrier while size is the same for the naked eye.

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Answer 1

Think about how many cars fit in a circle. If the circle is 20 feet across, you might be able to get 4-6 cars. If you make the circle 200 feet across you get about 50 cars.

If you stand in the middle of the circles you can’t see all the cars, of course, but you can see 1/3 to 1/2 of them. To see more of them, they have to get smaller (in angular width).