A screen is placed \( 90 \mathrm{~cm} \) from an object. The image ...

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A screen is placed \( 90 \mathrm{~cm} \) from an object. The image of an object on the screen is formed by a convex lens at two different locations separated by \( 20 \mathrm{~cm} \). The focal length of the lens is
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(A) \( 18 \mathrm{~cm} \)
(B) \( 21.4 \mathrm{~cm} \)
(C) \( 60 \mathrm{~cm} \)
(D) \( 85.6 \mathrm{~cm} \)
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