To construct ray diagram we use two light rays which are so chosen that it is easy to know their directions after reflection from the mirror. List these two rays and state the path of these rays after reflection. Use these rays to locate the image of an object placed between centre of curvature and focus of a concave mirror.
(1) These two rays are :
- A ray parallel to the principal axis after reflection will pass through the principal focus in case of a concave mirror and diverge from the principal axis in case of a convex mirror.
- A ray passing through the principal focus will emerge parallel to the principal axis after reflection.