Why do we Prefer a Convex Mirror as a Rear-View Mirror in Vehicles?

Answer: Usually, we prefer a convex mirror as a rear-view mirror in vehicles. The major reason behind this is that it provides a wider field of view. This permits the driver to view most of the traffic that is behind his vehicle. 

A convex mirror always creates a virtual image. When the object is far away from the convex mirror, the image that is created is upright as well as situated at the focal point. As the object arrives near the convex mirror, the image also comes near the mirror. Further, the image develops until its height becomes equal to that of the image. Convex mirrors form images that are smaller in comparison to the object. However, the object becomes larger as it comes near the mirror.