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8 A convex lens and a concave lens are kept in contact with common principal...

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8 A convex lens and a concave lens are kept in contact with common principal axes If f and f represents the focal length of the convex lens and concave lens respectively then If f 2 cm and f 5 cm then the equivalent focal length of the combination is 1 3 cm 2 7 cm 3 10 3 cm 4 10 3 cm

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