![]() Times and its field of view of 17 arc-minutes. Newton used curved mirrors to focus light and so created the first reflecting telescopes, or reflectors (Figure below). Long with its objective had an aperture of Typical astronomical telescope is the one made Was replaced by ones with more convex lenses. As early as 1611,īut showed that the addition of yet a third The Polish astronomer Johannes Hevelius assembled this telescope in the city of Danzig (nowadays Gdansk) in the 17th century. A simple refracting telescope consists of two lenses, the Objective and the eyepiece. A few years later, Galileoĭiscovered his own telescope which was goodĮnough to see Jupiter's moon. A refracting telescope uses a combination of lenses to produce an image of a distant object, e.g. Was good, the telescope could still not obtain very far away objects, such as the The object-glass, the main lens responsible for collecting the light, did not bend all wavelengths equally and this resulted in the red part of the light-beam being brought to a focus at a greater distance from the object-glass. Later, it was developed to view farther objects,Ĭolour effects due to poor quality of available It consisted of a convex and concave lens in In 1611 Johannes Kepler (15711630) designed a new kind of refracting telescope in which the eyepiece is composed of a convex, not a concave, lens. The first refracting telescope was invented by the Dutch spectable ![]() The role of the lenses is to concentrate light rays into a single point – the focal point – so as to obtain a sharper magnified image.Math 309-Refracting Teleschope-by May Wong 76956994 The larger of the two is the objective, or primary lens, and the second is the ocular. A telescope is a tool that astronomers use to see faraway objects. ![]() The first refracting telescopes consisted of two lenses separated by some distance within a closed tube. His book revolutionized our concept of the Universe. Galilei, however, was the first to have published his observations in a book entitled “The Starry Messenger” (translated from Latin). The English mathematician Thomas Harriot was the first to study the Moon in detail using an astronomical telescope in 1609, and it is known with certainty that this occurred several months before Galileo Galilei, the famous Italian physicist, did the same. Lippershey applied for a patent for what he claimed was his own invention, but was refused on the grounds that the device was already in existence. Since then, refracting telescopes have been used extensively in astronomy. The instrument did not become widely known to the public until 1608 when Hans Lippershey (or Lipperhey), a Dutch optician of German origin, began to make and sell telescopes. Galileos telescope used lenses to bend (refract) light to magnify distant objects. Leonard Digges – or perhaps his son, the English astronomer Thomas Digges – was also the first to turn a refractor towards the sky to study celestial objects. The first person to do so with certainty, and thus the person to be credited with its invention, was the English mathematician Leonard Digges who constructed a refracting telescope sometime between 15 to assist with his topographic surveys. Kepler used a convex lens for the eyepiece. The refractor was further improved by astronomer Johannes Kepler around 1611. Galileo made some improvements and first used the telescope for astronomy. It is difficult to determine when a refracting telescope was first assembled using lenses. The first telescope invented was a refractor invented by Dutch lensmaker Hans Lippershey in 1608. Other historical evidence reveals that the Arabs were using lenses by the year 600 AD, as were the Vikings around the year 900. The crystal was cut and polished into the shape of a lens, however it is not entirely certain that it was used as a magnifying lens and not as jewellery or for some other purpose.Įvidence that lenses were in use during the first century BC can be found in the records of the Roman authors Pliny and Senecio who reported that an engraver at Pompeii used a lens to help him in his work. The evidence is a rock crystal discovered by the English archaeologist John Layard in 1850 during the excavation of the ancient city of Nimrud. The Assyrians (people who lived in a region that is known today as Iraq) were perhaps the first to have used lenses to magnify objects, possibly around 1,500 BC.
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