A ray passing through the principal focus of a concave mirror, or directed towards the principal focus of a convex mirror, after reflection, emerges parallel to the principal axis.

In a concave mirror, a ray parallel to the principal axis, after reflection, passes through the principal focus. In contrast, in a convex mirror, the same ray appears to diverge from the principal focus after reflection.

The rays chosen for constructing ray diagrams are selected for their ease in determining their directions after reflection from the mirror. While an arbitrary number of rays could be considered, the chosen rays simplify the analysis and make it easier ...

The position of the image is determined by the intersection of at least two reflected rays. By choosing specific rays, it becomes possible to construct a clear ray diagram, and the point where these rays intersect gives the location of ...

The focal length (f) of a spherical mirror is the distance between the pole and the principal focus. It is represented by the letter f and provides a quantitative measure of the mirror’s ability to converge or diverge light rays.