A convex lens of focal length \( 40 \mathrm{~cm} \) is in contact with a concave lens of focal l...

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A convex lens of focal length \( 40 \mathrm{~cm} \) is in contact with a concave lens of focal length \( 25 \mathrm{~cm} \). The power of combination is
(A) \( -1.5 \mathrm{D} \)
(B) \( +6.5 \mathrm{D} \)
(C) \( -6.5 \mathrm{D} \)
(D) \( +6.67 \mathrm{D} \)
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