How are the image formed when an object is moved from infinity to convex lens
When an object is placed at infinity, the real image is formed at the focus. The size of the image is highly diminished and point size.
When an object is placed beyond the centre of curvature, the real image is formed between the centre of curvature and focus. The image size will not be the same as the object. It will be diminished in size.
When an object is at the centre of curvature, the real image is formed at the other centre of curvature. The size of the image is the same as compared to that of the object.
When an object is placed in between the centre of curvature and focus, the real image is formed behind the centre of curvature. The size of the image is larger than that of the object.
When an object is placed at the focus, a real image is formed at infinity. The size of the image is much larger than that of the object.
When an object is placed in between focus and optical centre, a virtual image is formed. The size of the image is larger than that of the object.
So, we can see as we move from infinity towards the lens, its image size increases and except the position of an object between pole and focus, nature of image is real and invertedA.