Uses of Convex Mirrors

Q. X is a mirror which has a smaller field of view than a plane mirror with the same aperture, and is a focusing mirror. X is

1. a concave mirror
2. a convex mirror
3. either a concave or a convex mirror
4. neither a concave nor a convex mirror.

Q. In parking mirrors a convex mirror is used instead of a plane mirror because:

1. Convex mirror is cheap to build
2. Convex mirror doesn't follow the laws of reflection
3. Convex mirror has a higher field of view as compared to a plane mirror of the same size
4. There is no such condition, even plane mirror can be used as a parking mirror.