Define real image of an object

(i) Define real image of an object.
(ii) Name the mirror that:
(a) can give real as well as virtual image of an object.
(b) will always give virtual image of same size of an object.
© will always give virtual and diminished image of an object.
(d) is used by a doctor in examining teeth, (tit) With the help of a ray diagram explain the
use of concave mirror as solar concentrators.

(i) It is an image formed when the reflected rays actually meet at a point.
(ii) (a) concave
(b) plane mirror
© convex mirror
(d) concave
(ii) The ray diagram is as shown :

Ray coming parallel to principal axis will pass through focus after reflection.