Name the type of mirror used as a side/rear-view mirror in a vehicle. Support your answer with a reason.

(CONVEX) The type of mirror used is a $Convex$ mirror.
Reason:
$1$. $Convex$ mirrors always form a virtual,erect,and diminished image of the objects placed in front of them.
$2$. They have a wider field of view compared to plane or concave mirrors,which allows the driver to see a larger area of the traffic behind the vehicle.
$3$. This helps the driver in safe driving by providing a better view of the road conditions behind.