A point object on the principal axis at a distance \( 15 \mathrm{~cm} \) in front of a concave m...

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A point object on the principal axis at a distance \( 15 \mathrm{~cm} \) in front of a concave mirror of radius of curvature \( 20 \mathrm{~cm} \) has velocity \( 2 \mathrm{~mm} / \mathrm{s} \) perpendicular to the principal axis. The magnitude of velocity of image at that instant will be:
(a) \( 2 \mathrm{~mm} / \mathrm{s} \)
(b) \( 4 \mathrm{~mm} / \mathrm{s} \)
(c) \( 8 \mathrm{~mm} / \mathrm{s} \)
(d) \( 16 \mathrm{~mm} / \mathrm{s} \)
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