How is the Image Formed by a Spherical Mirror? Image formation by Spherical mirror in different cases Introduction: From mirror formula, we find that for a mirror of a fixed focal length f, as object distance u changes, image distance n also changes. Image Formed by Concave mirrorObject at Infinity A point object lying on the principal axis. Rays come parallel to the … [Read more...] about How is the Image Formed by a Spherical Mirror?