A ray of light passing through focus of a concave mirror becomes parallel to the principal axis of the mirror on reflection. Comment. Is the reverse true ?

A ray of light going towards the focus of a convex mirror becomes parallel to the principal axis afterreflection form the mirror. Draw a labelled diagram to represent this situation.

A parallel beam of light, parallel to the principal axis of a concave mirror, on reflection meets at the :

Define the principal focus of a concave mirror.

Define the principal focus of a concave mirror.