A small piece of wire bent into an \( \mathrm{L} \) shape, with upright and horizontal portions ...

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A small piece of wire bent into an \( \mathrm{L} \) shape, with upright and horizontal portions of equal lengths, is placed with the horizontal portion along the axis of the concave mirror whose radius of curvature is \( 10 \mathrm{~cm} \). If the bend is \( 20 \mathrm{~cm} \) from the pole of the mirror, then the ratio of the lengths of the images of the upright and horizontal portions of the wire is
(1) \( 1: 2 \)
(2) \( 3: 1 \)
(3) \( 1: 3 \)
(4) \( 2: 1 \)
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