Question

why do we prefer a convex mirror as a rear view mirror in vehicles

Answer 1

In convex mirror, farther objects are seen nearer. By this, the driver is easily warned by the vehicles behind him.
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Answer 2

Answer:

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.