For every case of convex mirror, image of an object formed is virtual, erect, smaller than the object, at the back of the mirror and at the middle focus.Suppose there is an object named 00’. After reflection, the ray of light parallel to principal axis passes through focus. Another ray O’ B which appears to pass from centre of curvature C, gets reflected back in same path. Both these reflected rays appear to come from point I, which is the image of object 00. Image is formed between focus and pole which is virtual, erect and smaller than object.