![]() ![]() ![]() Refractors with a low focal ratio (f/5) provide superb low magnification, wide field views of the night sky. Refractors provide excellent colour contrast and thus are often used for looking at the moon and planets, especially refractors with a relatively high focal ratio (f/8 to f/10). They also require little to no maintenance, making them ideal for those new to the field or who want something convenient and easy to set up. Just as its name suggests, a refractor telescope works by refracting, or bending, light in order to form an image.Many entry level refractor telescopes come on a simple to operate mount, known as an Alt-Azimuth mount, and make for great first telescopes. Refractor Telescope: The refractor telescope is likely what comes to mind when one thinks of a telescope.There are different types of telescopes, they are It provides a means of collecting and analyzing radiation from celestial objects, even those in the far reaches of the universe. The telescope is undoubtedly the most important investigative tool in astronomy. Let’s take a look at the telescope and its impact on scientific history.Ī telescope is a device used to form magnified images of distant objects. Historians and scientists today still argue about who invented the telescope. It is easy to point to Hans Lipperhey as the inventor of the telescope, but the history of its invention is chaotic and confusing. His model inspired other scientists to work on perfecting the telescope. Lipperhey was a German-Dutch glass maker, and he managed to reduce the amount of light in his telescope while focusing it. Since then, a tremendous variety of complex astronomical instruments have been developed.Many people believe that Galileo Galilei was the first astronomer to invent and build the telescope however, the first telescope was made by Hans Lippershey in the early 1600s. The first purpose built radio telescope went into operation in 1937. The 20th century also saw the development of telescopes that worked in a wide range of wavelengths from radio to gamma-rays. The largest reflecting telescopes currently have objectives larger than 10 m (33 feet), and work is underway on several 30-40m designs. ![]() Reflecting telescopes, though not limited by the color problems seen in refractors, were hampered by the use of fast tarnishing speculum metal mirrors employed during the 18th and early 19th century-a problem alleviated by the introduction of silver coated glass mirrors in 1857, and aluminized mirrors in 1932.The maximum physical size limit for refracting telescopes is about 1 meter (40 inches), dictating that the vast majority of large optical researching telescopes built since the turn of the 20th century have been reflectors. The invention of the achromatic lens in 1733 partially corrected color aberrations present in the simple lens and enabled the construction of shorter, more functional refracting telescopes. The idea that the objective, or light-gathering element, could be a mirror instead of a lens was being investigated soon after the invention of the refracting telescope.The potential advantages of using parabolic mirrors-reduction of spherical aberration and no chromatic aberration-led to many proposed designs and several attempts to build reflecting telescopes.In 1668, Isaac Newton built the first practical reflecting telescope, of a design which now bears his name, the Newtonian reflector. Galileo heard about the Dutch telescope in June 1609, built his own within a month,and greatly improved upon the design in the following year. Their development is credited to three individuals: Hans Lippershey and Zacharias Janssen, who were spectacle makers in Middelburg, and Jacob Metius of Alkmaar. The earliest recorded working telescopes were the refracting telescopes that appeared in the Netherlands in 1608. They found use in terrestrial applications and astronomy. The first known practical telescopes were invented in the Netherlands at the beginning of the 17th century, using glass lenses. A telescope is an instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light). ![]()
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