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In order to take the sharpest camera shoot from the reflected object image in the mirror, the camera should be placed $x\,m$ farther from the reflected image object.

enter image description here

How can I determine $x$ ?

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closed as off-topic by BMS, DavePhD, Jim, John Rennie, Kyle Kanos May 15 '14 at 17:23

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up vote 2 down vote accepted

You can't without knowing the focal length of the camera. Remember that all a flat mirror does is "fold" the distances in the system. Unfold the optical path and adjust as appropriate for the camera's focal length.

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