In the diagram, the shape of the lens is
and the image is

The lens used is a concave lens. Concave lens is a diverging lens

Here object is kept anywhere on the principal axis - between Infinity and Optical center (O)

First, we draw a ray parallel to principal axis.

So, it appears to pass through focus after reflection.

Another ray is drawn which pass through optical center.

So, the ray will go through without any deviation.

Where both reflected rays meet, an image is formed. The image is formed between F1 and the optical center.

The characteristics of the image are:

if they have a finite resultant