3D prospective question

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I have been trying to find the answer to this question for some time.
If an object appears to be 1 meter wide at say 1 meter away, how far away would it have to be to appear 1/2 meter wide. Or 1/4 meter wide.
At what rate does an object appear smaller as it moves farther away from the camera.
I hope you understand my question.

I need to know this so I can calculate the ideal distance from the camera a mesh can be used with half the poly count.
And then 1/4 the poly count, etc..