CBSE notes-Light
CBSE notes-Light Principal focus of concave and convex mirror. :Principal focus of a concave mirror (i) The principal focus of a concave mirror is a point on its principal axis to which all the light rays, which are parallel and close to the axis, converge after reflection from the concave mirror. (ii) A concave mirror has real focus. Principal focus of a convex mirror (i) The principal focus of a convex mirror is a point on its principal axis from which a beam of light rays, initially parallel to the axis, appear to diverge after being reflected from the convex mirror.