Do it
Use the lens to create an image of the objects seen through the window on the screen. Answer the question.
The lens should be placed between the window and the screen so that its convex surface is facing the window. The distance between the screen and the lens should be approximately the same as the focal length of the lens (the focal length of the lens in our experiment set is about ). The experiment works best if the (classroom) is dim and light comes from only one window.