Converging lens with the object at 2F

An example figure from the Ray Diagram Generator.

A ray diagram of a converging lens with the object at 2F and a real, inverted image of the same size at 2F′, with the object and image distances marked d_o and d_i — A converging lens of focal length 10 cm with the object at 2F, 20 cm away. The three principal rays meet at 2F′ on the far side, where the image is real, inverted and the same size as the object. Arrows below the axis mark the object distance d_o and the image distance d_i.

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Answer key (real is positive)

Image distance: 20 cm, magnification: −1
Real, inverted, same size, on the far side of the lens

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