Apparent and actual radius (Optics!)
I know the radius of a circle. I'm taking pictures of the circle as I bring it closer to the camera. Obviously the radius is getting larger. I want to know what the relationship is to find this out? I know the distance from the camera that the circle is at all times.
Re: Apparent and actual radius (Optics!)
I think the concept you're looking for is linear magnification a.k.a. transverse magnification:
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