The magnification of an object placed it front of a convex lens of focal length \( 20 \mathrm{~c...

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The magnification of an object placed it front of a convex lens of focal length \( 20 \mathrm{~cm} \) is \( +2 \). To obtain a magnification of \( -2 \), the object will has to be moved a distance equal to
(A) \( 10 \mathrm{~cm} \)
(B) \( 30 \mathrm{~cm} \)
(C) \( 20 \mathrm{~cm} \)
(D) \( 40 \mathrm{~cm} \)
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