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.

In a convex mirror, rays parallel to the principal axis are reflected in such a way that they appear to diverge from a point on the principal axis. This point is known as the principal focus of the convex mirror, ...

The principal focus of a concave mirror is the point where all reflected rays, parallel to the principal axis, converge or intersect. This convergence of rays defines the principal focus and is represented by the letter F.

The distance of the image (bright spot) from the position of the mirror provides an approximate value of the focal length of the concave mirror. This observation allows for a practical understanding of the mirror’s focusing properties and aids in ...

The concave mirror converges the light from the Sun at a specific point, forming a sharp, bright spot on the paper. This spot represents the image of the Sun and serves as the focus of the mirror.