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An object is placed at a distance of \( 15 \mathrm{~cm} \) from a convex lens of focal length \( 10 \mathrm{~cm} \). On the other side of the lens, a convex mirror is placed at its focus such that the image formed by the combination coincides with the object itself. The focal length of the convex mirror is
(A) \( 20 \mathrm{~cm} \)
(B) \( 10 \mathrm{~cm} \)
(C) \( 15 \mathrm{~cm} \)
(D) \( 30 \mathrm{~cm} \)
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