KnowraLoupeLoupeA loupe is a small magnifying lens, often mounted in a frame, used to inspect fine details at close range.BriefConnectSimple magnifier: A single converging lens that produces an enlarged virtual image when an object lies within its focal length. A loupe is a handheld form of this basic optical instrument.Jeweler's loupe: A compact magnifier used to inspect gemstones, jewelry, and small watch components. Gem grading and setting often require close inspection under controlled magnification.Magnifying glass: A handheld convex lens, usually mounted in a handle, for enlarging nearby objects. Unlike many loupes, it is designed for broader viewing through a larger lens.Convex lens: A lens thicker at its center than at its edges that converges parallel light rays. Most loupes use a convex lens to create an enlarged virtual image.Reading stone: A transparent, lens-shaped object placed over text to enlarge it by magnification. Reading stones are early precursors to handheld magnifiers and loupes.Virtual image: An image formed where light rays appear to originate, rather than where they actually converge. A loupe presents magnified detail as a virtual image.Watchmaker's loupe: A small magnifier worn or held near the eye for examining watch mechanisms and components. Watch repair uses loupes to inspect tiny gears, pivots, and adjustments.Microscope: An instrument that uses one or more lenses to form enlarged images of small objects. A microscope generally provides greater magnification and more elaborate imaging than a loupe.Diopter: A unit of optical power equal to the reciprocal of focal length measured in meters. Diopters quantify the optical power commonly marked on magnifying lenses.Roger Bacon: A thirteenth-century English philosopher who wrote about the use of lenses for magnifying vision. His writings document medieval knowledge of lenses used to aid sight.Show all 26Linked from 1 pageShow all 1