Use the convex and concave lenses in the classroom and try to recreate an image of the objects outside the classroom window with both lenses. Hold each lens a short distance awayr from a solid white wall or object, and try to create an image of what is outside the window on the white wall/object. Compare what you see on the white wallfobject with your drawing above. How are the images you created on the white wall/object related to what you drew above