Why can you not use a concave mirror as a rear-view mirror in vehicles?

Fill in the following blank with a suitable word:

A ray of light which is parallel to the' principal axis of a _______, appears to be coming from focus after reflection from the mirror.

Why does a driver prefer to use a convex mirror as a rear-view mirror in a vehicle ?

Where would the image be formed by a convex mirror if the object is placed:

(a) between infinity and pole of the mirror?

(b) at infinity ?

Draw labelled ray-diagrams to show the formation of image in both the cases.

The shiny outer surface of a hollow sphere of aluminium of radius 60cm is to be used as a mirror :

(a) What will be the focal length of this mirror?

(b) Which type of spherical mirror will it provide ?

(c) State whether this spherical mirror will diverge or converge light rays.