A magnifying glass

A magnifying glass is a single convex lens which is used to produce a magnified image of an object. The lens is usually mounted in a frame with a handle. The magnifying glass is the simplest form of optical microscope. Photo of a classic spy magnifying glass over a felt-tip pen. ... Photo of a classic spy magnifying glass over a felt-tip pen. ... In mathematics, an object is convex if for any pair of points within the object, any point on the straight line segment that joins them is also within the object. ... A lens is a device for either concentrating or diverging light, usually formed from a piece of shaped glass. ... Magnification is the process of enlarging something only in appearance, not physical size. ... Image of the Wikimedia Commons logo. ... A microscope (Greek: micron = small and scopos = aim) is an instrument for viewing objects that are too small to be seen by the naked or unaided eye. ...

A magnifying glass works by creating a magnified virtual image of an object behind the lens. The distance between the lens and the object must be shorter than the focal length of the lens for this to occur. Virtual image is a term used in optics and physics. ... The focal point F and focal length f of a positive lens, a negative lens, a concave mirror, and a convex mirror. ...

Magnifying glass on an arm lamp

The framed lens may be mounted on a stand, keeping the lens at the right distance from the table, and therefore at the right distance from the object on the table. The latter applies if the object is small, and also if the height is adjustable. Some magnifying glasses are foldable (from the handle or stand). Download high resolution version (750x1143, 66 KB)Magnifying glass, US Navy Newsstand photo, PD 030903-N-2143T-001 Central Command Area of Responsibility (Sept. ... Download high resolution version (750x1143, 66 KB)Magnifying glass, US Navy Newsstand photo, PD 030903-N-2143T-001 Central Command Area of Responsibility (Sept. ...

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. Lens of a lighthouse in Rozewie A Fresnel lens is a type of lens invented by Augustin-Jean Fresnel. ...

The magnifying glass is an icon of detective fiction, particularly that of Sherlock Holmes. Detective fiction is a branch of crime fiction that centres upon the investigation of a crime, usually murder, by a detective, either professional or amateur. ... Sherlock Holmes Sherlock Holmes is a fictional detective of the late 19th and early 20th century, created by British author and physician Arthur Conan Doyle. ...

See also

• Burning-glass