A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. the power of the combination is

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A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. the power of the combination is

A. +6.67D
B. -6.5D
C. -1.5D
D. +6.5D

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