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A comvex lens and a concave lens are pla...

A comvex lens and a concave lens are placed in contact. The ratio of magnitude of the power of the convex lens to that of the concave lens is 4:3. If the focal length of the convex lens is 12 cm, then the focal length of the combination will be

A

16 cm

B

24 cm

C

32 cm

D

48 cm

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