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An object is placed $12\text{ cm}$ in front of a concave mirror, and a real image is formed $6\text{ cm}$ in front of the mirror.

Which of the following values is the focal length of this mirror?

A

$0.25\text{ cm}$

B

$2\text{ cm}$

C

$4\text{ cm}$

D

$-12\text{ cm}$

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