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The concave mirror is used for various purposes
(i) Principal focus : A number of rays parallel to the principal axis, after reflection from a concave mirror, meet at a point on the principal axis which is called the principal focus.
(ii) Convex mirror always gives an erect though diminished- image. They have a wider field of view as they are curved outwards and hence the driver can view much larger area.
(iii) The diagram is as shown :
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