The graph in Fig. 9 (CF). 7 shows how the inverse of magnification \( 1 / \mathrm{m} \) produced...
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0The graph in Fig. 9 (CF). 7 shows how the inverse of magnification \( 1 / \mathrm{m} \) produced by a convex thin lens varies with object distance \( u \). What was the focal length of the lens used ?
(A) \( \frac{b}{c} \)
(B) \( \frac{b}{c a} \)
(C) \( \frac{b c}{a} \)
(D) \( \frac{c}{b} \)
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