Why does a driver use a convex mirror instead of a plane mirror as a rear view mirror? Illustrate your answer with the help of a ray diagram.
A convex mirror diverges the incident beam and always forms a virtual, small and erect image between its pole and focus. Thus, a driver can see all the traffic approaching from behind as its field of view is wider. This fact enables the driver to use it as a rear view in vehicles to see all the traffic approaching from behind.