The image orientation/position is located above the principal axis the same with the object's location.
UPRIGHT
The point between the center of curvature and vertex
FOCAL POINT
The image is located infront of a mirror.
REAL
The image is located at the back of the mirror.
VIRTUAL
The distance between vertex and center of curvature
RADIUS OF CURVATURE
The image orientation is found below the principal axis in contrast with object location..
INVERTED
The point in the center of the sphere from which the mirror was equally divided into half.
CENTER OF CURVATURE
The center of the mirror
VERTEX
The distance from the mirror's vertex and focal point.
FOCAL LENGTH