Here you have the ray diagrams used to find the image position for a diverging lens. A diverging lens always form an upright virtual image.
Ray diagrams are constructed by taking the path of two distinct rays from a single point on the object:
Virtual images are produced when outgoing rays from a single point of the object diverge (never cross). The image can only be seen by looking in the optics and cannot be projected.
Click and drag horizontally the body.
Click and drag vertically the head.
Click and drag the focal point F'.