Summary ray diagrams

At `2F` (at two principal focal lengths).

Ray diagram of object at 2F

At `1F` (at one principal focal length).

Ray diagram of object at 1F

At greater than `2F` (at more than two principal focal lengths).

Ray diagram of objects at a distance greater than 2F

Between `2F` and `F` (between two principal focal lengths and one principal focal length).

Ray diagram of objects between 2F and F

Between `F` and lens (between one principal focal lengths and the lens).

Ray diagram of objects between F and the convex lens

and a summary in block format would be.

Combined block format ray diagram

NOTE: The NO is to show that there is nothing in this triangle.