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An object is placed in front of a thin convex lens of focal length \( 30 \mathrm{~cm} \) and a plane mirror is placed \( 15 \mathrm{~cm} \) behind the lens. If the final image of the object coincides with the object, the distance of the object from
P the lens is
(A) \( 60 \mathrm{~cm} \)
(B) \( 30 \mathrm{~cm} \)
(C) \( 15 \mathrm{~cm} \)
(D) \( 25 \mathrm{~cm} \)
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