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Where should a divergent lens be placed to get the image to be infinite?

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A small object is placed 40 cm in front of a converging lens with a focal point f = 20 cm. We also have a divergent lens with f = −20 cm; where should it be placed if we want the image to be infinite?

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asked Feb 25, 2021 in Closed Questions by anonymous [ no revision ]
recategorized Mar 1, 2021 by Dilaton

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