Question

Convex mirror is used as a rear view mirror give reasons

Answer 1

Because the image is smaller, more image can fit onto the mirror, so a convex mirror provides for a larger field of view than 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.

Answer 2

Explanation:

We use convex mirror as a rear view mirror in the vehicles because convex mirror always forms virtual, erect and diminished images irrespective of distance of the object. ... Convex mirror forms very small image than the object. Due to this reason convex mirrors are used as rear view mirrors in vehicles.