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[" A lens forms a real image of an objec...

[" A lens forms a real image of an object at a distance of "20cm" .It is observed that on placing another identical lens in contact with it,the image gets "],[" shifted by "10cm" towards the combination.The power of the lens is "]

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A real image of an object is formed at a distance of 20 cm from a lens. On putting another lens in contact with it, the image is shifted 10 cm towards the combination, Determine the power of the second lens.

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