Постройте изображение предмета, находящегося между фокусом и двойным фокусом собирающей линзы. Какое это изображение?

Unclear question. Here's the clear rendering of the text;

"Build an image of the subject between the focus and the double focus of the collecting lens. What is this image?".

Explanation:

Based on the information above you are to conduct an experiment using a lens to view the image provided.

Also based on the type of image, there are two types of lenses you can use:

Thus, by doubling the focus of the lens you should be able to identify the shape the image.

and 1and 1

see earlier