New answers tagged viewfinder
If a converging lens has focal length f, a subject which is position p relative to the lens will generate an image at location q=f/(f/p-1) [the fundamental equation is f/p+f/q=-1]; the ratio of image sizes will be p:q. When p and q have the same sign, the image will be on the same side of the lens as the object, and the size ratio will be positive. When p ...
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