Question

Why is convex mirror preferred by drivers as a rear view mirror,instead of a plane mirror?

Answer 1

Convex mirrors are also known as diverging mirror as they diverges the light rays coming towards them.Because of this,they have larger field of view.So these mirrors are also used as a rear view mirror.By using this mirror,a driver can see a larger rear view.Plane mirrors are not diverging mirrors.They produce an image whose size is same as the object.So they are not preferred.
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Answer 2

Explanation:

We prefer a convex mirror as a rear-view mirror in vehicles because it gives a wider field of view, which allows the driver to see most of the traffic behind him. Convex mirrors always form a virtual, erect, and diminished image of the objects placed in front of it.