What Is A Telescope?
In general, a telescope is really a device which magnifies the degree of visibility of distant objects, making these physical objects much more amenable to viewing. The telescope was initially utilized by the early astronomers to monitor the sky and to discover new celestial bodies. Telescopes were instrumental in the advancement of science and in the development of newer and much more efficient methods of seeing celestial phenomena, like the sun’s activities, the planets’ movements around the solar system, and the moon’s waxing and waning. It took a long time before contemporary science was in a position to develop technologies which would supersede the usefulness with the telescope. Even after the advent of the Hubble Space Telescope, refracting telescopes remain extremely helpful for astronomers and budding scientists, in their missions to learn the character of the universe, and the Earth’s place in it. Now, you will find two common groups for telescopes that are optical- 1st is the refracting-type telescope, and the 2nd is the reflecting-type telescope.
What is a refracting telescope? A refracting telescope has 3 general parts (which indicates, regardless of how contemporary a refracting telescope is, it would nevertheless possess these main parts as the foundation for other parts): the telescope tube, the objective lens and also the eyepiece lens. The easiest explanation for a refracting telescope could well be this: a refracting telescope is made up of a couple of lenses that are convex, that is usually much thicker in the very middle than on the edges. This design enables colors and light to be targeted much more clearly and sent much more efficiently towards the eyepiece lens. The component of the telescope that is much more near to the object being observed (regardless of whether it be a turtle, a star or somebody in a faraway window) is known as the objective lens. What happens technically is that this specific lens collects the color and light from a particular source, and then focuses this as an image that’s upside down inside the tube of the telescope. In less complicated telescopes, the images remain inverted; however, in the much more contemporary versions, the images may be righted by unique lenses inside the telescope. Other modern versions of the telescope, in addition, have recording devices situated near the eyepiece lens, so you may be able to record the things which you are observing. These kinds of telescopes are helpful particularly if you like observing meteor showers, and other kinds of celestial phenomena which don’t visibly happen very frequently in the world’s open skies.
Reflecting telescopes, however, make use of a distinct kind of lens. Instead of possessing a convex lens, reflecting telescopes possess a curved lens that was specifically designed to bring back and magnify images. The power of a reflecting telescope to collect and concentrate light from a source may be achieved by maximizing the area of the reflecting telescope’s mirror. Big reflecting telescopes that may be discovered in astronomical installations had been built especially to observe the skies twenty-four hours each day.
I hope our discussion of what is a telescope has helped. Please make sure and review our other posts on telescopes for additional information.
History Of Telescope
The telescope is one of the great inventions of all. It makes men powerful to see the distant object clearly. It was one of the great revolutions of the seventeenth century, though there are some documents available who shows that its concept is of before 17th century but there is no any clear design available. It is also considered that telescope is the invention of a craftsman but they were illiterate so no proof available. It often becomes the part of controversy between followers of geocentric astronomy and of heliocentric astronomy.
The news about the discovery of such kind of instrument came into existence in 1608 by Hans Lipperhey of Middelburg, he came to patent this instrument and later this was an attempt by Jacob Metius of Alkmaar. This news was like a fire in Europe. In 1609, three powered spyglasses were in the market by Pont Neuf in Paris. And later it was available in Italy. But we consider Galileo as the father of Telescope because of this device famous. He constructed and presented eight powered instruments in August 1609 and made 20 powered instruments. This instrument was capable to observe moon and satellites of Jupiter and some stars patches. Since there were no sufficient instruments available at that time so initially it was difficult for everyone to see some lunar or other details of the distant object. But there were some shortcoming of this telescope: firstly it has a small field of view i.e. about 15 arc minutes and also polish was poor.
With the time many new inventions made in the telescope, the high-quality polish was made, and Galilean telescope of higher magnification was made but because of the concomitant shrinking of the field.
The Galilean telescope could be used for both purpose i.e. terrestrial and celestial, but after the 17th century, the Galilean telescope was replaced for terrestrial purposes by the terrestrial telescope, which had four convex lenses known as objective, ocular, erector lens, and a field lens. In the starting of 1640s, the length of the telescope was increased. The Galilean telescope was of 5 or 6 feet but astronomical telescope was of 15 to 20 feet. Magnification power of astronomical telescope was about 100 times. But long telescope was not worth for observation. After 1675 astronomers started using pole by means of ball-joint and aimed by means of a string. Many high-quality telescopes were designed in the middle of eighteenth and 19th century. Now a day every type of telescope is being available in the market.