A converging beam of rays is incident on a diverging lens. Having passed through the lens the ra...

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A converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point 15 \( \mathrm{cm} \) from the lens on the opposite side. If the lens is removed the point where the rays meet will move \( 5 \mathrm{~cm} \) closer to the lens. The focal length of the lens is
(a) \( -30 \mathrm{~cm} \)
(b) \( 5 \mathrm{~cm} \)
(c) \( -10 \mathrm{~cm} \)
(d) \( 20 \mathrm{~cm} \)
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