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A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is_____________?

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A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is_____________?

A. f2 + f1
B. f2 – f1
C. f1f2/f2+f1
D. f1f2/f1-f2