9/1/2023 0 Comments Refractor telescope diagram![]() Unfortunately because light is not one color but a combination of the rainbow of colors, this presents another problem. These defects reduce the overall light gathering ability of the lens by blocking small amounts of light passing through the lens.Īlso, the lens material has to be polished to a high degree of accuracy so that all of the light will focus to a point. expensive) to do even with todays glass manufacturing methods. This was, and still is, somewhat difficult (e.g. In a refractor, light has to pass THROUGH the glass material, therefore in order to get good quality, bright images in the telescope, the glass has to be as pure and free of defects, free of air bubbles, and free of inclusions (particles of matter or minerals which are not the same translucense as the glass material) as possible. ![]() Refracting telescopes have two main problems however - images are not always clear because the light is being bent through the glass creating a prism effect, and the physical size of the lens is limited (which limits the light gathering power of the telescope). Similar to how a standard magnifying glass magnifies print on a page in a book. If someone looks into the telescope eyepiece, another concave lens at the opposite end of the telescope tube, it magnifies the image which is at the point of focus. The point of focus is where the image is created. This allows all of the light to come together at a focal point. This lens is thicker in the center than it is toward its edges, which bends the light more at the edge of the lens than light coming through the center. It uses a convex glass lens (to bend light and bring it into focus. A lens at one end of a tube, with the eyepiece and focuser at the other end, on a tripod mount of some kind.Ī refracting telescope works just like a magnifying glass. This (above) is what most people not famliliar with astronomy think of when you mention the word "telescope". Galileo could see objects 20 times smaller than the human eye could using his telescope. Galileo also used his refracting telescope to map mountains and craters on the surface of the moon, confirmed the phases of Venus, observed and analyzed sunspots, and misidentified the rings of Saturn as two bodies on either side of the planet which confusingly disappeared from time to time, as well as discovering that the Milky Way, thought at the time to be nebulous, was actually a multitude of stars packed so densly that they appeared to be clouds to the naked eye. He used it to discover the four largest of the moons orbiting Jupiter. Galileo Galilee made the first refracting telescope used to study space in 1609. ![]() He put the lenses into a tube to make the first refracting telescope. He found that a distant object appeared to be much closer when he looked at it through a concave lens and a convex lens held in front of each other. A Dutch optician (someone who makes lenses for glasses), Hans Lippershey, designed the convex lens for the first refracting telescope in 1608. ![]()
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