Question

why convex mirror is known as rear view mirror

Answer 1

Here is the answer
Because the image is smaller, more image can fit onto themirror, so a convex mirrorprovides for a larger field of viewthan a plane mirror. This is why they are useful. They are used whenever a mirror with a large field of view is needed. For example, the passenger-side rear view mirror on a car is convex.
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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.