Plane mirrors are those mirrors whose reflecting surface is flat and smooth and plane mirrors always produce the image of the object behind the mirror at the same distance as that of object distance from mirror and image formed by a plane mirror is of the same size as that of object’s size. whereas Concave and convex mirrors are types of spherical mirrors. A concave mirror is one whose reflecting surface is bent inwards and the outer curved part is polished whereas a convex mirror is one in which the reflecting surface is bent outwards and the inner surface is polished. Plane mirrors have zero radii of curvature but concave and convex mirrors have the same definite value of their radius of curvature.