1. The problem statement, all variables and given/known data I was doing this experiment. Let's look at this image: Suppose we get the imaginary object at dv by convergence lens. And this object is like a real object for the concave lens. Then how do we get a real object on the screen? It is known that only virtual objects can be made on the screen by convex lenses, and the image should be before the real object and after the lens. 2. Relevant equations According to TLE (Thin lens equation) we can find the focal point, however i'm confused about what is real and imaginary here. 3. The attempt at a solution I had tried hard to draw ray diagram for this one. No success in forming an imaginary image in dv or real image at dr.