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A typical magnification for use in dentistry is 2.5×, but dental loupes can be anywhere in the range from 2× to 8×. [15] Optimal magnification is a function of the type of work the doctor does - namely, how much detail he or she needs to see, taking into consideration that when magnification increases, the field of view decreases.
In 1996, Hand Held Products launched a mobile computer with 2D imaging technology, the Dolphin 7200. In 1997, the Hand Held Product's Dolphin portable computer was selected by the United States Postal Service to be part of their proof of delivery system, although a third party provided the manufacturing. The deal was the industry's largest ever ...
The maximum angular magnification (compared to the naked eye) of a magnifying glass depends on how the glass and the object are held, relative to the eye. If the lens is held at a distance from the object such that its front focal point is on the object being viewed, the relaxed eye (focused to infinity) can view the image with angular ...
A Coddington magnifier is a magnifying glass consisting of a single very thick lens with a central deep groove diaphragm at the equator, thus limiting the rays to those close to the axis, which minimizes spherical aberration. This allows for greater magnification than a conventional magnifying glass, typically 10× up to 20×. Most single lens ...
The assembly stands 2.54 metres (8.3 ft) tall and weighs about 1.5 tonnes (3,300 lb). A Fresnel lens ( / ˈ f r eɪ n ɛ l , - n əl / FRAY -nel, -nəl ; / ˈ f r ɛ n ɛ l , - əl / FREN -el, -əl ; or / f r eɪ ˈ n ɛ l / fray- NEL [ 1 ] ) is a type of composite compact lens which reduces the amount of material required compared to a ...
A dome magnifier is a dome-shaped magnifying device made of glass or acrylic plastic, used to enlarge words on a page or computer screen. They are plano-convex lenses : the flat (planar) surface is placed on the object to be magnified, and the convex (dome) surface provides the enlargement.
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