If an object is placed at the focus of a concave mirror, where is the image formed?

Where should an object be placed in front of the concave mirror so as to obtain its virtual, erect and magnified image?

For which positions of the object does a concave mirror produce an inverted, magnified and real image?

If an object is at infinity (very large distance) in front of a concave mirror, where is the image formed?

For what position of an object, a real and diminished image is formed by a concave mirror?