A point source O is placed at a distance of 12.5 cm from a converging lens of focal length 10 cm, on its principal axis as shown in tr e figure. Find the distance at which a diverging mirror of tocal length 20 cm should be placed, so that a real image is formed on the source itself.

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A point source S is placed at a distance of 15 cm from a converging lens of focal length 10 cm on its principal axis. Where should a diverging mirror of focal length 12 cm be placed so that a real image is formed on the source itself?

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