Okay, the numbers 1 refers to the stand 1 and numbers 2 refers to number 2

as you may see number 1 is smaller because it is far away than number 2.

now, what branch of science or what physics law states it.

then ok. im gonna ask this.

how to determine the smalness of the number 1 compared to number 2?

let's say the distance between them is 54 cm

is there any formula?

i hope everyone got me

thnx

 

You are talking about perspective. I 'd say it belongs to geometry, under 3d space.

If you can, read these wikipedia articles. They may be available in a decent translation in your language too.

http://en.wikipedia.org/wiki/Perspective_(visual)
http://en.wikipedia.org/wiki/Perspective_(graphical)

It is a very important technique for painters, as it imitates 3d world appearance in a 2d canvas.