Which English scientist and philosopher invented the magnifying glass in 1250?
Magnifying glass forming a magnified image was described in the "Book of Optics" by Ibn al-Haytham in 1021. After the book was translated during the Latin translations of the 12th century, Roger Bacon described the properties of a magnifying glass in 13th-century England. This was followed by the development of eyeglasses in 13th-century Italy. The magnification of a magnifying glass depends upon where it is placed between the user's eye and the object being viewed, and the total distance between them. The "magnifying power" is equivalent to angular magnification (this should not be confused with optical power, which is a different quantity).
Magnifying glass the ability to search or zoom, especially in computer software and websites. Magnifying glass 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. The lens is usually mounted in a frame with a handle (see image). A magnifying glass can be used to focus light, such as to concentrate the sun's radiation to create a hot spot at the focus for fire starting. A sheet magnifier consists of many very narrow concentric ring-shaped lenses, such that the combination acts as a single lens but