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An object is placed in front of two convex lenses one by one at a...

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An object is placed in front of two convex lenses one by one at a distance u from the lens The focal lengths of the lenses are 30 cm and 15 cm respectively If the size of image formed in the two cases is same then u is 1 15 cm 2 20 cm 3 25 cm 4 30 cm

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