text: concave mirror? an object is placed in front of a concave mirror with a 45.0 cm radius of curvature. a real image twice the size of the object is formed. at what distance is the object from the mirror?   cm away since the magnifying power is m = h(image)/h(object) = d(image)/d(object):  height of image = 2 height of object = 1  magnification = 2/1 = 2   distance of object = d(image)/m = 45cm/2 = 22.5 cm