
#1
Jan2213, 03:21 PM

P: 1

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.




#2
Jan2213, 03:26 PM

Mentor
P: 11,239

I think the concept you're looking for is linear magnification a.k.a. transverse magnification:
http://hyperphysics.phyastr.gsu.edu...ensdet.html#c2 


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