$A$ concave mirror of focal length $f$ produces a real image $n$ times the size of the object. The magnitude of the distance of the object from the mirror is:
- A$\frac{f}{n}$
- B$\left( \frac{n}{n+1} \right)f$
- C$\left( \frac{n+1}{n} \right)f$
- D$(n+1)f$
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