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Where should a convex lens of focal leng...

Where should a convex lens of focal length 9cm be placed (in cm) between two point sources `S_(1)` and `S_(2)` where are 24 cm apart, so that images of both the sources are formed at the same place. You have to find distance of lens from `S_(1)` or `S_(2)` whichever is lesser.

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