So you got a cheap camera. It only zooms 4x, if it zooms at all. No need to let that stop you from taking a decent macro (close up) shot of something like a flower or bug. Or you have an "ultra zoom" camera and want just a little more "zoom". Holding a magnifying lens is a great way to have fun, learn something, and get good results.
Let's see what you can do with this neat little trick.