Hamza and The Investigators take a look at lenses and optical systems that change the size of what you see, and shows how they work. Lenses are used in magnifying glasses, microscopes, cameras, binoculars and telescopes. Lenses are slices of spheres, and light passes through glass or water, it refracts, or bends. Convex lenses make things look bigger, and concave lenses make large things look smaller. A photographer demonstrates how a pinhole camera (or camera obscura) flips an image.