(Science behind the Situations-1) Why do we see the size variation in objects by the variation of distances between them and us?

Ok, coming to the point now what do see in these pictures? Easily you can notice the Eiffel Tower here but photographed from different distances. You can also see many bulidings. But anybody noticed that why it is small when seeing it from far and big when seeing from near? 

But today I thought about this thing and I asked myself Why? Why it happens?

I researched about it today and understood it. It just took me few minutes and I'll explain it in simple manner to understand about this correctly. 

It is because that when the distance changes, our visual angle means the angle we see the object here is increased when we come near to it because it occupies the most space and the angle we see it increases rapidly, also the apparent height (the height we normally see but not actual and not necessary) will be more than the actual and we have to see higher to the clouds to it's peak to see the whole object. Imagine this one guys. With imagination you can understand very clearly. Imagination can take you every where (This was said my Einstein not me XDDD)

When we go far, the visual angle decreases and the apparent height also decreases than the actual height and you see it like very short and I can hide this with my finger. 

By some analysis, you can predict that the visual angle and apparent height are inversely proportional to the distance between the observer and objects. 

Mathematicians made an equation on it that I saw in the Internet that

Apparent Height = Actual Height/ Distance. If you don't understand my explaination, you can understand by a method. Take a cone. Not ice cream cone guys but the traffic cone you see on roads or the simple come made by a paper. Just assume.

 

If you see from the small end, you can see the image in larger size because the angle is increasing.

If you see from the larger end, you can see the image in smaller size because the angle is decreasing. 

I think you understood my explaination guys. Ok that's it for now, Bye. 

Stay Awesome.