Image construction in a mirror

From point B of object AB, the ray going through C (Red) reflects to itself, the ray going through F (Green) reflects itself in parallel to the axis, the ray parallel to the axis (Blue) reflects itself by going through F and the ray going through S (Orange) reflects itself symetrically in relation to the axis.

B' is at the intersection of emerging rays, A' is on the projection of B' on the axis.