My textbook states that the linear magnification of concave mirrors can either be equal to one, less than one, or greater than one. It seems plausible enough considering the fact that concave mirrors can form images of the same size, diminished images, or enlarged images. However, upon further thought, I'm confused about the fact that the linear magnification m, can be equal to one.
If the object is placed at the centre of curvature, the image formed is real, inverted and of the same size. Hence, h2 (the size of the image) would be negative (as it is inverted), and h1 (the size of the object) would be positive (as it is assumed to be erect). Therefore, m = (h2)/(h1) = (-h1/h1) = -1.
This seems to contradict the fact that m can be equal to one.
Can someone please correct me if I'm wrong?