An obeject is placed in front of two covex lenses one by one t a distance of
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An object is placed in front of two convex lenses one by one at adistance u from the lens .The focal lengths of the lenses are 30cm and 15cm respectively.If the size of image formed in the two cases is same then u is. a.15cm b.20 cm c.25cm d.30cm.
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