If \( f_{1}=12 \mathrm{~cm}, f_{2}=-18 \mathrm{~cm} \) find the max...

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If \( f_{1}=12 \mathrm{~cm}, f_{2}=-18 \mathrm{~cm} \) find the maximum focal length of the combination?
(A) \( 36 \mathrm{~cm} \)
(B) \( 34 \mathrm{~cm} \)
(C) \( 32 \mathrm{~cm} \)
(D) \( 30 \mathrm{~cm} \)
\( \mathrm{P} \)
W
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