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A lens with a focal length of 20 cm is placed 50 cm in front of...

A lens with a focal length of 20 cm is placed 50 cm in front of a lens with a focal length of 5.0 cm. Part A. How far from the second lens is the final image of an object infinitely far from the first lens? Part B. Is the image in part a in front of or behind the second lens?

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