Question

Use the ray diagrams below the answer the following question. Where should an object (O) be placed to produce an image that is upright, virtual, and smaller?

Answer 1

the position of an object with a virtual image must be in between the points 2F' and F'

Step-by-step explanation:

Due to the geometric optics laws, you know that, in order to generate a virtual image, you need that the projections of divergent rays cross in some point at the same region in which the object O is present (left or right of the lens).

By observing the fourth ray diagram you can notice that a virtual image has been generated. Then, the position of an object with a virtual image must be in between the points 2F' and F', as you can see in the fourth ray diagram.