Using the mirror formula , compute the position  of the object placed in front of a concave mirror of focal length f. so that the image formed is of a same size of the object.            

If the image is of same size,
Then the object is placed at centre of curvature.(C)
Magnification is one meaning same size.(m=hi/ho=1)
Mirror formula need not be used.
 

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when the size of object is equal to the size of image the the object is placed at centre of curvature and   hi   = ho
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