1. Conves mirror forms an image that is virtual, erect and smaller than the object, whatever be the position of the object.
2. Concave mirror may form an image that is real, inverted and smaller/equal/larger in size than the object, depending on position of the object. Only when the object is between the pole and focus , the image formed is virtual, erect and magnified.
3. A ray of light passing through a glass slab emerges parallel to the incident ray but is laterally displaced.