A magnifying glass (called a hand lens in laboratory contexts) is a convex lens that is used to produce a magnified image of an object.Here at Outdoor Shopping we offer the best strong/powerful hand held magnifying glass with lights, with survival tools, small, large, and illuminated, just to name few. Some are even pocket sized. A sheet magnifier consists of many very narrow concentric ring-shaped lenses, such that the combination acts as a single lens but is much thinner. This arrangement is known as a Fresnel lens. Great for spying, bug viewing, reading, books, fine print, desktop, lamp, jewelry.