(1) The reflecting surface of the concave mirror is
bulged inwards. But the reflecting surface of the
convex mirror is bulged outwards.
(2) Concave mirror produces real and inverted
images (except when the object is placed
between pole and focus. When the object is
placed between F and P, concave mirror produces
virtual and erect image). But the convex mirror
always produces virtual and erect images.
(3) The image formed by the concave mirror may
be enlarged or diminished, according to the
position of the object. The image formed by the
convex mirror will be always diminished.