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-   -   Apparent and actual radius (Optics!) (http://www.physicsforums.com/showthread.php?t=666082)

Healthycola Jan22-13 03:21 PM

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.

jtbell Jan22-13 03:26 PM

Re: Apparent and actual radius (Optics!)
 
I think the concept you're looking for is linear magnification a.k.a. transverse magnification:

http://hyperphysics.phy-astr.gsu.edu...ensdet.html#c2


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