Question

why convex mirror is use as a side view mirror why not concave mirror​

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

Answer:

The size is larger as compared to the object. Uses of convex mirrors: The convex mirror is used as a side-view/rear – view mirror of a vehicle because it forms an erect and smaller image. Convex mirror gives a wide rear view.