(charge-coupled devices-think camcorder)Īllow for long exposure times (dim things become bright!)Ġ. The largest telescope dome is for the largest refractor, not the largest Diagram of a Refracting Telescope The first refracting telescope was invented by Hans Lippershey in 1608. A common model for a reflecting telescope is a Cassegrain telescope, which uses two. The diagram below shows how the objective lens and eyepiece work together in a simple telescope. The bigger lens is an objective lens, while the smaller lens is an eyepiece lens. In most refracting telescopes, there are two lenses in which is the objective lens, and the other is the eyepiece lens. To be long, since short focal length refractors are hard to make. Reflecting telescopes use mirrors while refracting telescopes use lenses. The lens is one of the necessary parts of a telescope. Together the mirror and lens 'steer' the rays. Each ray exits the lens at a different angle. The 3 rays then pass through a glass lens. Each ray hits a mirror and is reflected off at 90 degrees. Lets go over the diagram of a Newtonian telescope below to see. To make: glass has to be good all the way through The ray diagram in the picture shows 3 'rays' of light entering the telescope. Refracting telescopes use a convex lens to help produce images, while reflecting telescopes namely rely on a concave mirror. Instruments that are too heavy to move with the telescope 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? Afocal literally means without a focal length. Features: A refractor telescope consists of two converging lenses (here represented by vertical lines) aligned along and centered on an optical axis.The one to the left is the objective (AKA primary) lens and the one to the right is the eyepiece. = speed of radiation (in this case, light)Īt least two lenses, objective and eyepiece An optical system for which the rays in object and image space are parallel, or equivalently a system for which the object is at - and the image at + (infinite conjugates) is termed an afocal system. Caption: A schematic diagram of the Keplerian telescope, a classic refractor telescope. Something moves toward you, radiation emited from it has an apparently There must be very dense things is the foil somewhere Section meets TOMOROW EVENING (Wed Feb 16 in 6515 Sterling Hall). 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
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