Each ray exits the lens at a different angle. For viewing Earth objects, an additional lens or a prism must be used to produce an erect image. Simple telescopes of this general design are used for viewing astronomical objects. The 3 rays then pass through a glass lens. Schematic diagram of a two-lens telescope that produces an inverted image. Each ray hits a mirror and is reflected off at 90 degrees. (charge-coupled devices-think camcorder)Īllow for long exposure times (dim things become bright!)Ġ. The ray diagram in the picture shows 3 'rays' of light entering the telescope. The largest telescope dome is for the largest refractor, not the largest To be long, since short focal length refractors are hard to make. To make: glass has to be good all the way through Caption: A schematic diagram of the Keplerian telescope, a classic refractor telescope. Most refracting telescopes use two main lenses. A common model for a reflecting telescope is a Cassegrain telescope, which uses two. This type of telescope is called a refracting telescope. Instruments that are too heavy to move with the telescope Reflecting telescopes use mirrors while refracting telescopes use lenses. To be just right (why you need a focus adjustment)Īngle of reflection equals angle of incidenceīig would the primary have to be for you to be at the prime focus? = speed of radiation (in this case, light)Īt least two lenses, objective and eyepiece Something moves toward you, radiation emited from it has an apparently There must be very dense things is the foil somewhere Together the mirror and lens steer the rays. They have the following parts: a long tube, made of metal, plastic, or wood. Refractors are the type of telescope that most of us are familiar with. Each ray exits the lens at a different angle. Kepler's design is still the major design of refractors today, with a few later improvements in the lenses and the glass to make them. The 3 rays then pass through a glass lens. Section meets TOMOROW EVENING (Wed Feb 16 in 6515 Sterling Hall). The ray diagram in the picture shows 3 rays of light entering the telescope. The portability, high contrast views, and quick cooldown time make them ideal telescopes for beginners and advanced users. Astronomy 104: Lecture 7 (Slide 1)Astronomy 104: Lecture 7 (Slide 2)Astronomy 104: Lecture 7 (Slide 3)Astronomy 104: Lecture 7 (Slide 4)Astronomy 104: Lecture 7 (Slide 5)Astronomy 104: Lecture 7 (Slide 6)Astronomy 104: Lecture 7 (Slide 7)Astronomy 104: Lecture 7 (Slide 8)Astronomy 104: Lecture 7 (Slide 9)Astronomy 104: Lecture 7 (Slide 10)Astronomy 104: Lecture 7 (Slide 11) Back A refractor telescope is one of the most commonly bought telescopes on the market, and for good reason.
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