Here, in this post, we listed 2 rules for the formation of images by Concave Lens. After studying these, it will be easier to study the image formation by concave lenses, and related ray diagrams.
Rules for the formation of images by Concave Lens
The position of the image formed by a concave lens can be found by considering the following two rays coming from a point object (as explained below).
(i) A ray of light coming parallel to the principal axis, after refraction, appears to pass through the principal focus F of the lens when produced backward as shown in Figure (a).
(ii) A ray of light passing through the optical center O of the lens goes strength without suffering any deviation as shown in Figure (b).