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A magnifying glass (called a hand lens in laboratory contexts) is a convex lens that is used to produce a magnifiedimage of an object. The lens is usually mounted in a frame with a handle. 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 is much thinner. This arrangement is known as a Fresnel lens.
The magnifying glass is an icon of detective fiction, particularly that of Sherlock Holmes.
History[edit]
'The evidence indicates that the use of lenses was widespread throughout the Middle East and the Mediterranean basin over several millennia'.[1] The earliest explicit written evidence of a magnifying device is a joke in Aristophanes's The Clouds[2] from 424 BC, where magnifying lenses to ignite tinder were sold in a pharmacy, and Pliny the Elder's 'lens',[3] a glass globe filled with water, used to cauterize wounds. (Seneca wrote that it could be used to read letters 'no matter how small or dim').[4][5] A convex lens used for forming a magnified image was described in the Book of Optics by Ibn al-Haytham in 1021.[6][verification needed] 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.[6]
Magnification[edit]
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). The magnifying power is the ratio of the sizes of the images formed on the user's retina with and without the lens.[7] For the 'without' case, it is typically assumed that the user would bring the object as close to one eye as possible without it becoming blurry. This point, known as the near point of accommodation, varies with age. In a young child, it can be as close as 5 cm, while, in an elderly person it may be as far as one or two metres. Magnifiers are typically characterized using a 'standard' value of 0.25 m.
The highest magnifying power is obtained by putting the lens very close to one eye, and moving the eye and the lens together to obtain the best focus. The object will then typically also be close to the lens. The magnifying power obtained in this condition is MP0 = (0.25 m)Φ + 1, where Φ is the optical power in dioptres, and the factor of 0.25 m represents the assumed near point (¼ m from the eye). This value of the magnifying power is the one normally used to characterize magnifiers. It is typically denoted 'm×', where m = MP0. This is sometimes called the total power of the magnifier (again, not to be confused with optical power).
However, magnifiers are not always used as described above because it is more comfortable to put the magnifier close to the object (one focal length away). The eye can then be a larger distance away, and a good image can be obtained very easily; the focus is not very sensitive to the eye's exact position. The magnifying power in this case is roughly MP = (0.25 m)Φ.
A typical magnifying glass might have a focal length of 25 cm, corresponding to an optical power of 4 dioptres. Such a magnifier would be sold as a '2×' magnifier. In actual use, an observer with 'typical' eyes would obtain a magnifying power between 1 and 2, depending on where lens is held.
Alternatives[edit]
Concentricseneca Laptops & Desktops Driver Download
Concentricseneca Laptops & Desktops Driver Downloads
Magnifying glasses typically have low magnifying power: 2×–6×, with the lower-power types being much more common. At higher magnifications, the image quality of a simple magnifying glass becomes poor due to optical aberrations, particularly spherical aberration. When more magnification or a better image is required, other types of hand magnifier are typically used. A Coddington magnifier provides higher magnification with improved image quality. Even better images can be obtained with a multiple-lens magnifier, such as a Hastings triplet. High power magnifiers are sometimes mounted in a cylindrical or conical holder with no handle. This is called a loupe.
Such magnifiers can reach up to about 30×, and at these magnifications the aperture of the magnifier becomes very small and it must be placed very close to both the object and the eye. For more convenient use or for magnification beyond about 30×, one must instead use a microscope.
Use as a symbol[edit]
The magnifying glass (i.e. , or U+1F50D in Unicode: 🔍) is commonly used as a symbolic representation for the ability to search or zoom, especially in computer software and websites.[8][9]
See also[edit]
| Wikimedia Commons has media related to Magnifying glasses. |
References[edit]
- ^Sines, George; Sakellarakis, Yannis A. (Apr 1987). 'Lenses in Antiquity'. American Journal of Archaeology. 91 (2): 191–6. doi:10.2307/505216.
- ^Aristophanes, The Clouds, 765–70.
- ^Pliny the Elder, Natural History, 36.67, 37.10.
- ^Seneca, Natural Questions, 1.6.5–7.
- ^The history of the telescope by Henry C. King, Harold Spencer Jones Publisher Courier Dover Publications, 2003 Pg 25 ISBN0-486-43265-3, ISBN978-0-486-43265-6
- ^ abKriss, Timothy C.; Kriss, Vesna Martich (April 1998). 'History of the Operating Microscope: From Magnifying Glass to Micro neurosurgery'. Neurosurgery. 42 (4): 899–907. doi:10.1097/00006123-199804000-00116. PMID9574655.
- ^Hecht, Eugene (1987). Optics (2nd ed.). Addison Wesley. pp. 186–188. ISBN0-201-11609-X.
- ^'What are all the symbols used by computers?'. Computer Hope. Jan 24, 2018. Retrieved 2019-04-01.
- ^Harley, Aurora (July 27, 2014). 'Icon Usability'. Nielsen Norman Group. Retrieved 2019-04-01.
DriverPack Solution is a freeware driver installer software download filed under drivers and made available by DriverPack Solution for Windows.
The review for DriverPack Solution has not been completed yet, but it was tested by an editor here on a PC and a list of features has been compiled; see below. We have found that this software contains advertisements or other ad-supported elements during runtime.
Driver updating software which downloads and installs updatesDriverPack Solution is a program that greatly simplifies the process of installing drivers by automating the process. No longer do you have to deal with any more problems regarding searching for the right drivers and then installing them as this software will allow you to install all the required drivers on any Windows-based computer with just a few clicks of the mouse.
The program is designed to be used by anyone from home users to system administrators, offering you an easy, quick and efficient way of installing the correct drivers for the devices attached to your computer and then keeping them up to date.
In addition, this software supports a very wide range of devices such as PCI, ACPI, USB devices, PNP and more.
Features and highlights
- Simplifies downloading new drivers from the Internet
- All required drivers will be installed with only a few clicks
- Automatically install all the drivers on any computer
- Update the existing drivers to the newest versions
- Supports 32-bit and 64-bit versions
- User-friendly interface
DriverPack Solution 17.11.47 on 32-bit and 64-bit PCs
This download is licensed as freeware for the Windows (32-bit and 64-bit) operating system on a laptop or desktop PC from drivers without restrictions. DriverPack Solution 17.11.47 is available to all software users as a free download for Windows.
Though marketed as 'freeware', this download actually includes adware or something which resembles adware like toolbars or browser modifications.
Though this program tested positive for virus tests, some people don't view it as a virus or malware. This could mean toolbars or system modifications.
Filed under:- DriverPack Solution Download
- Freeware Drivers
- Major release: DriverPack Solution 17.11
- Driver Instalation Software