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need help with the attached problem #1 on optics

problem #2 is a short one, not necessary, but if you have time, would be much appreciated–will give extra tip

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Subject: Physics, Science
A converging lens L1 and a diverging lens L2, with focal length f1 = 4-0 Cm and f2 (unknown) respectively, are separated by a distance D = 1 m as
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