A concave lens by itself cannot form a real image on a screen, since it is a diverging lens. Hence, a different method must be used for measuring its focal length. This is done by placing the negative lens in contact with a positive lens of shorter focal length whose focal length is known. The equivalent focal length of the combination can be measured experimentally, and the focal length of the negative lens computed using equation (3).

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Accompanied refers to an object being loosely bound and accompanying a mobile host, e.g., a smartphone can be carried in a bag or pocket but can easily be misplaced.[2] Hence, mobile hosts with embedded devices such as an autonomous vehicle can appear larger than pocket-sized.

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The magnification produced by a lens (the linear magnification) is defined as the ratio of the height of the image to the height of the object. This can be shown, by the use of geometry for similar triangles, to be equal to the ratio of the image distance to the object distance. Thus

Dust refers to miniaturized devices without direct HCI interfaces, e.g., micro-electromechanical systems (MEMS), ranging from nanometers through micrometers to millimeters. See also Smart dust. Skin: fabrics based upon light emitting and conductive polymers and organic computer devices. These can be formed into more flexible non-planar display surfaces and products such as clothes and curtains, see OLED display. Also, see smart device.

In 2009, developments in mobile collaboration systems enabled the use of handheld devices that combine video, audio, and on-screen drawing capabilities to enable multi-party conferencing in real-time, independent of location.[12] Handheld computers are available in a variety of form factors, including smartphones, handheld PDAs, ultra-mobile PCs and tablet computers (Palm OS, WebOS).[13] Users can watch television through the Internet by IPTV on some mobile devices. Mobile television receivers have existed since 1960,[14] and, in the 21st-century, mobile phone providers began making television available on cellular phones.[15]

There are several lenses at your work station. Two of them are double concave lenses, and the rest of them are double convex. Take one of the convex lenses and measure its focal length by focusing a distant object or light source on the screen. Use an object four or more meters from the lens to do this accurately. Measure the distance from the lens to the screen where the image is sharply focused as the focal length of the lens. Record the distance in a data table. Do the same for each of the convex lenses at your station.

Handheld devices such as enterprise digital assistants have become more rugged for use in mobile field management. This involves tasks such as digitizing notes, sending and receiving invoices, asset management, recording signatures, managing parts, and scanning barcodes and RFID tags.

When you have completed this experimental activity, you should be able to: (1) define focal length; (2) differentiate between positive and negative lenses; (3) measure focal length for a single thin lens and for combinations of thin lenses; and (4) distinguish between a real image and a virtual image.

The most common size of a mobile computing device is pocket-sized, but other sizes for mobile devices exist. Mark Weiser, known as the father of ubiquitous computing,[3] referred to device sizes that are tab-sized, pad, and board sized,[4] where tabs are defined as accompanied or wearable centimeter-sized devices, e.g. smartphones, phablets and tablets are defined as hand-held decimeter-sized devices. If one changes the form of the mobile devices in terms of being non-planar, one can also have skin devices and tiny dust-sized devices.[2]

where feq is the equivalent focal length of the lens combination, and f1 and f2 are the focal lengths of the two lenses that make the combination.

The history of the mobile device has been marked by increasing technological convergence. Early mobile devices—such as pocket calculators, portable media players, satellite navigation devices, and digital cameras—excelled at their intended use but were not multifaceted. Personal digital assistants (PDAs) proliferated in the 1990s as a way to quickly write down notes, schedule business appointments, and set personal reminders, as a handheld supplement to bulkier laptops.

Measure the size of the grid object, and compute the magnification as the ratio of image size to object size for each set of data that you have. Compare this to the ratio of image distance to object distance (equation 2), using percent difference, for each data set. Look carefully at the two magnifications for the two positions of the same lens. What is the relationship between these magnifications?

Using the lens equation (1), calculate the focal length of each lens or lens combination. Since you have found two focused positions for each lens, you should compute two values of focal length for each lens from the data. Average these two values. Compare, using percent difference, this average value with the value found by focusing a distant object. What do you notice about the object and image distances for the two positions of the same lens?

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With the object and screen still fixed in the same positions, move the lens back and forth along the optical bench until another position is found where sharp image is formed on the screen. Record the object and image distances for this location, as well as the image size.

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Report the best value you have for the focal length of each lens, including the concave lens. Report any relationships that you have observed during the analysis, and comment on the difference between positive and negative lenses.

The principal focal length of a converging lens may be determined by forming an image of a very distant object on a screen and measuring the distance from the lens to the screen. This distance will be the focal length, since rays of light from a very distant object are very nearly parallel. A more accurate method of determining the focal length of a positive lens is to measure the image distance corresponding to a suitable and known object distance, and to calculate the focal length from the lens equation (1).

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Although mobility is often regarded as synonymous with having wireless connectivity, these terms are different. Not all network access by mobile users, applications, and devices needs to be via wireless networks and vice versa. Wireless access devices can be static and mobile users can move between wired and wireless hotspots such as in Internet cafés.[2] Some mobile devices can be used as mobile Internet devices to access the Internet while moving, but they do not need to do this and many phone functions or applications are still operational even while disconnected from the Internet.

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2023422 — Focal Length Examples. To find the focal length of a lens, measure the distances and plug the numbers into the focal length formula. Be sure all ...

From the lens combination using the concave lens, calculate the focal length of the concave (negative) lens. The algebraic value from the computation comes out negative, which is why it is called a negative lens. Why could you not measure the focal length of this concave lens by itself?

A mobile device or handheld computer is a computer small enough to hold and operate in hand. Mobile devices are typically battery-powered and possess a flat-panel display and one or more built-in input devices, such as a touchscreen or keypad. Modern mobile devices often emphasize wireless networking, to both the Internet and to other devices in their vicinity, such as headsets or in-car entertainment systems, via Wi-Fi, Bluetooth, cellular networks, or near-field communication.[1]

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In the 2010s, mobile devices were observed to frequently include the ability to sync and share a variety of data despite the distance or specifications of the devices. In the medical field, mobile devices are quickly becoming essential tools for accessing clinical information such as drugs, treatment, and even medical calculations.[16] Due to the popularity of mobile gaming, the gambling industry started offering casino games on mobile devices, which led to the inclusion of these devices in the anti-hazard legislature as devices that could potentially be used for illegal gambling. Additional potentially unlawful actions could encompass the utilization of mobile devices in disseminating explicit material involving minors. Moreover, the legitimate adult entertainment sector's incorporation of mobile apps and technology to advance its operations raises concerns. There is also a prospect of leveraging mobile devices to facilitate cross-border services, warranting regulatory attention.

When two thin lenses are in contact, the equivalent focal length of the combination may be measured experimentally by one of the above methods. It may also be calculated in terms of the individual focal lengths as:

During the same period, the mobile phone evolved from supporting voice communication only to accommodating text messaging, Internet connectivity, multimedia, and videotelephony.[7] These feature phones eventually gave way to the modern smartphone, which combined all the aforementioned devices, and more, into one device. Since the late 2000s, smartphones have been the most common mobile device in the world, in terms of quantity sold, owing to their great convergence of technologies.[8][9][10]

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By the early 2010s, mobile devices began integrating sensors such as accelerometers, magnetometers, and gyroscopes, allowing the detection of orientation and motion.[11] Mobile devices may provide biometric user authentication, such as face recognition or fingerprint recognition.

Strictly speaking, many so-called mobile devices are not mobile. It is the host that is mobile, i.e., a mobile human host carries a non-mobile smartphone device. An example of a true mobile computing device, where the device itself is mobile, is a robot. Another example is an autonomous vehicle.

What makes the mobile device unique compared to other technologies is the inherent flexibility in the hardware and software. Flexible applications include video chat, web browsing, payment systems, near field communication, audio recording etc.[5] As mobile devices become ubiquitous, there will be an increase of services which include the use of the cloud.[6] Although a common form of mobile device, a smartphone, has a display, another perhaps even more common form of smart computing device, the smart card, e.g., used as a bank card or travel card, does not have a display. This mobile device often has a CPU and memory but needs to connect or be inserted into a reader to display its internal data or state.

3 — Optic means relating to the eyes or to sight. The reason for this is that the optic nerve is a part of the brain.

When a beam of rays parallel to the principal axis of a lens impinges upon a converging lens, it is brought together at a point called the principal focus of the lens. The distance from the principal focus to the center of the lens is the focal length of the lens; the focal length is positive for a converging lens and negative for a diverging lens.

Most optical instruments in common usage have one or more lenses in them. Whether it is a microscope, a telescope, or even a simple magnifying glass, the crucial element is a lens. The formation of images by lenses is one of the most important studies in the field of optics. In particular, in this experiment you will measure the focal length of both positive and negative lenses, and examine a combination of thin lenses.

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Jul 11, 2019 — Often any lens that falls between 55mm to 500mm can be categorized as a long-focus lens. You may hear a cinematographer or camera operator refer ...

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Within the military domain, mobile devices have introduced novel prospects for delivering training and educational resources to soldiers, irrespective of their stationed location.[17]

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The relation between the object distance (p), the image distance (q), and the focal length (f) of a thin lens is given by the lens equation:

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Now you will determine the focal length of each lens by a different method, using the lens equation (1). Take the convex lens with the shortest focal length, and place it in a lens holder on the optical bench. Place the light source and grid object at one end of the optical bench, and place the white cardboard screen at a distance of about 5 times the focal length of the lens from the object, with the lens between the object and screen. Leave the object and screen fixed, and move the lens along the bench until a sharp image of the grid object forms on the screen. Measure the distance between the object and the lens, and between the lens and the screen, and record these in a data table. Also, measure the size of the image on the screen.

Multilateral trading facilities are a type of trading venue in the European Union operated by a regulated entity such as an investment firm.

Repeat this procedure for each of the convex lenses at your station. Record the data for each lens in an organized manner for later analysis. Also, pick any two convex lens and carefully place them into a single lens holder. Repeat the procedures for measuring focal length for this lens combination. Finally, place the concave lens and the shortest focal length convex lens together in a lens holder, and measure the focal length of this combination.