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Position of object (u) reflected from concave varies from $0$ to $\infty$ which of the graph represents the variation of object distance (v) with respect to (u)

$\large\frac{1}{f}=\frac{1}{u} +\frac{1}{v}$
at $u=f;v=\infty$
at $u=0;v=0$
Hence a is the correct answer.
edited Jan 17, 2014 by meena.p