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  Telescope , device used to form magnified images of distant objects. The telescope is undoubtedly the most important investigative tool in astronomy. It provides a means of collecting and analyzing radiation from celestial objects, even those in the far reaches of the universe. Galileo revolutionized astronomy when he applied the telescopes to the study of extraterrestrial bodies in the early 17th century. Until then, magnification instruments had never been used for this purpose. Since Galileo’s pioneering work, increasingly more powerful optical telescopes have been developed, as has a wide array of instruments capable of detecting and measuring radiation in every region of the electromagnetic spectrum. Observational capability has been further enhanced by the invention of various kinds of auxiliary instruments (e.g., the camera, spectrograph, and charge-coupled device) and by the use of electronic computers, rockets, and spacecraft in conjunction with telescope systems. These...

telescope , traditionally, a system of lenses, mirrors, or both, used to gather light from a distant object and form an image of it. Traditional optical telescopes, which are the subject of this article, also are used to magnify objects on earth and in astronomy; other types of astronomical telescopes gather radio waves. Types of Optical Telescopes There are three major types of optical telescopes, classified according to the element that gathers and focuses the incoming light. In the refracting telescope, or refractor, light is bent, or refracted, as it passes through an objective lens. The objective lens is convex, i.e., thicker at the middle than the edges. Parallel light passing through the lens is refracted so that it converges to a point behind the lens, called the focus. The distance from the lens to the focus is called the focal length. In a reflecting telescope, or reflector, light is reflected by a concave mirror and brought to a focus in front of the mirror. If paral...

  We offer laptop repair guides, troubleshooting, service manual for all kinds of laptops, computers, and ultra-books. We also provide teardown and disassembly photos for some new laptops and ultra-books. Laptop repair problems can be divided into software failures and hardware failures. Software failures are relatively simple, and reinstalling the operating system can solve the problem; if it is a hardware failure, it may include the motherboard, CPU, hard disk, memory, screen failure, etc. Regardless of any problems with your laptop, you can find a computer repair solution on our website. Of course, if you do not find a solution, you can also contact us to find a way to repair your computer. We will be happy to help you, and these services are free of charge.  laptop repair dha lahore How To Fix Laptop Battery Not Charging Laptop battery plugged in not charging is a serious problem as it leads to severe delays in your work and causes uncalled for stress. Here is a list...

  Early   telescopes  focused light using pieces of curved, clear glass, called lenses. However, most telescopes today use curved mirrors to gather light from the night sky. The shape of the mirror or lens in a telescope concentrates light. That light is what we see when we look into a telescope. A telescope is a tool that astronomers use to see faraway objects. Most telescopes, and all large telescopes, work by using curved mirrors to gather and focus light from the night sky. The first telescopes focused light by using pieces of curved, clear glass, called lenses. So why do we use mirrors today? Because mirrors are lighter, and they are easier than lenses to make perfectly smooth. The mirrors or lenses in a telescope are called the “optics.” Really powerful telescopes can see very dim things and things that are really far away. To do that, the optics—be they mirrors or lenses—have to be really big. The bigger the mirrors or lenses, the more light the telescope can gathe...

  The launch of NASA’s James Webb Space  Telescope  (JWST) has been delayed once again. Its planned launch date has slipped from March 2021 to 31 October 2021, partially due to the coronavirus pandemic. This is just the latest in a series of delays and budget overruns since the beginning of the project in 1996. Since then, the scope of the project has broadened and the budget expanded from $0.5 billion to $9.6 billion. The most recent delay was announced in 2018, along with another increase in the budget, and moved the launch date from May 2020 to March 2021. This new delay will not come with a budget increase, said NASA Science Mission Directorate associate administrator Thomas Zurbuchen in a 16 July press conference. Instead, it will be paid for by additional funds that were allocated to the mission in the last delay.  Telescopes Of the seven-month delay, the coronavirus pandemic is to blame for at least three months of scheduling slip, said JWST program director G...

Laptops have become thinner, lighter, faster and their screens more brilliant than ever before. However, packing all this technology in an increasingly shrinking form factor has made it increasingly difficult to repair when the time comes. Unlike with laptops that were sold a few years ago, today the latest Ultrabook's are a lot thinner but also a lot more difficult to disassemble and have few replaceable and repairable parts.  Laptops that can be repaired can only be repaired by a certified PC repair technician who has been especially trained to carry out laptop repairs of these kinds. laptop repair dha lahore computer repair dha lahore Here are 5  reasons repairing the latest laptops have become increasingly expensive: The use of proprietary components:  This is one of the leading reasons why repairing laptops have become expensive. In order to keep things light and small many manufacturers have to make custom components that are only standardized for th...