Here is my question: Take an object A and another object B, both of the same size.
B is rigid (static) but A is mobile . If I took A further away from observer then it goes on shrinking. Why is that the case ??😶😶
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If I understand your question correctly, you wonder why when an object is far away it seems smaller?
This can be explained with basic trigonometry.
In this triangle, let say your object A has a height given by the distance $h=HF$
If we call the distance between your eyes and the object $d=EF$
Then the height that you see is linked to the angle at the corner $E$. Let's call that angle $\theta$.
Then, you have $\theta=arctan(h/d)$
As d gets bigger, the angle $\theta$ will decrease and it will seem that the objects is shrinking.