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Illustration Thin Lens - Object and Image Distance, Focal Length

Thin lens - object width, image width, focal length
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An apple has the height \(G\) (object size) and is imaged with a lens. The object is located at a distance \(g\) from the lens (object distance). The image of the object produced by the lens has the size \(B\) (image size) and the image has the distance \(b\) to the lens (image distance). The lens has the focal length \(f\).