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13.When two conversing lenses of same focal length f are placed in contact , then the focal length of the combination is (1) f (2) 2f (3) f/2 (4) 3f

Answer» 13.When two conversing lenses of same focal length f are placed in contact , then the focal length of the combination is (1) f (2) 2f (3) f/2 (4) 3f


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