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  3. A convex lens of focal length 18 cm and a concave lens of focal length 24 cm are placed in contact such that they have a common principal axis

. A convex lens of focal length 18 cm and a concave lens of focal length 24 cm are placed in contact such that they have a common principal axis

Will the combination act as a convex lens or a concave lens? Find the focal length and power of the combination

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