The object must be placed between the focus and the pole of the concave mirror to create an upright enlarged picture.

AD is drawn parallel to the primary axis in the image below, thus D is reflected and passes through the focal F. The second ray, AE, is reflected back after passing through the centre of curvature and striking E. The two diverging rays that do not connect on the left side are DF and EC. Backwards production of DF and EC They seem to intersect at point A’ when they are generated backward. As a result, A’ is the virtual representation of point A. A’B’ is drawn perpendicular to the axis to get an expanded picture.