A point object is placed at a distance of \( 12 \mathrm{~cm} \) from a convex lens of focal leng...

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A point object is placed at a distance of \( 12 \mathrm{~cm} \) from a convex lens of focal length \( 10 \mathrm{~cm} \). On the other side of the lens, a convex mirror is placed at a distance of \( 10 \mathrm{~cm} \) from the lens 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) \( 25 \mathrm{~cm} \)
(c) \( 15 \mathrm{~cm} \)
(d) \( 30 \mathrm{~cm} \)
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