Whenever I see hand lenses, I am reminded of my father using it to read fine prints - moving/focusing it towards and away. And also of my experiments with it in my boyhood days. Then I focused a lens on the house wall to get the inverted image of the windows! I tried also to make a camera with it, and a negative film of the inverted windows' image! With it I even viewed film strips on dark room wall using battery light as light source! I also used it outdoors on a piece of paper or a wisp of cotton to burn them - by sharp focusing of sun rays!
