What is the change of image observed as the object is moved from infinity towards the concave lens?

A concave lens forms different types of images when the object is placed at

    1. Infinity

    2. Between infinity and optical centre, O

When the object is at infinity, an image is formed by a concave lens at principal focus F1.

Properties of Image: Image is point sized, highly diminished, virtual and erect.

When an object is placed between the optical centre and infinity of a concave lens, the image is formed between principal focus F1 and optical centre, O.

Properties of Image: Image is diminished, virtual and erect.