Posted by Anonymous on Friday, August 12, 2011 at 10:34pm.
The answer depends upon the focal length of the mirror, not the height of the object. A plane mirror has a focal length of infinity.
Using the equation
1/Do + 1/Di = 1/f = 0,
which you should know by now,
you will find that Do (the object distance) equals MINUS the image distance, Di.
Thus the image is 15 mm behind the mirror.
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