Loose Leaf For Explorations: Introduction To Astronomy
9th Edition
ISBN: 9781260432145
Author: Thomas T Arny, Stephen E Schneider Professor
Publisher: McGraw-Hill Education
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Chapter 5, Problem 2QFR
To determine
The difference between reflecting and refracting telescope. Advantage of reflecting telescope.
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Check out a sample textbook solutionChapter 5 Solutions
Loose Leaf For Explorations: Introduction To Astronomy
Ch. 5 - What is light-gathering power? How does it affect...Ch. 5 - Prob. 2QFRCh. 5 - Prob. 3QFRCh. 5 - Prob. 4QFRCh. 5 - What is the purpose of an interferometer?Ch. 5 - Prob. 6QFRCh. 5 - Why do astronomers put X ray observatories in...Ch. 5 - Prob. 8QFRCh. 5 - Prob. 9QFRCh. 5 - Prob. 10QFR
Ch. 5 - Apart from magnification, how do binoculars help...Ch. 5 - Prob. 2TQCh. 5 - Prob. 3TQCh. 5 - Is it better to have a telescope with a high...Ch. 5 - Prob. 5TQCh. 5 - Prob. 6TQCh. 5 - Prob. 7TQCh. 5 - Prob. 8TQCh. 5 - Prob. 1PCh. 5 - Estimate your eyes resolving power by drawing two...Ch. 5 - Can the unaided human eye resolve a crater on the...Ch. 5 - Prob. 4PCh. 5 - Prob. 5PCh. 5 - Prob. 6PCh. 5 - Prob. 7PCh. 5 - Prob. 1TYCh. 5 - Prob. 2TYCh. 5 - Prob. 3TYCh. 5 - Prob. 4TYCh. 5 - Prob. 5TYCh. 5 - Prob. 6TYCh. 5 - Prob. 7TYCh. 5 - Prob. 8TYCh. 5 - Prob. 9TY
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- People are often bothered when they discover that reflecting telescopes have a second mirror in the middle to bring the light out to an accessible focus where big instruments can be mounted. “Don’t you lose light?” people ask. Well, yes, you do, but there is no better alternative. You can estimate how much light is lost by such an arrangement. The primary mirror (the one at the bottom in Figure 6.6) of the Gemini North telescope is 8 m in diameter. The secondary mirror at the top is about 1 m in diameter. Use the formula for the area of a circle to estimate what fraction of the light is blocked by the secondary mirror. Figure 6.6 Focus Arrangements for Reflecting Telescopes. Reflecting telescopes have different options for where the light is brought to a focus. With prime focus, light is detected where it comes to a focus after reflecting from the primary mirror. With Newtonian focus, light is reflected by a small secondary mirror off to one side, where it can be detected (see also Figure 6.5). Most large professional telescopes have a Cassegrain focus in which light is reflected by the secondary mirror down through a hole in the primary mirror to an observing station below the telescope.arrow_forwardWhen astronomers discuss the apertures of their telescopes, they say bigger is better. Explain why.arrow_forwardTelescopes can now be operated remotely from a warm room, but until about 25 years ago, astronomers worked at the telescope to guide it so that it remained pointed in exactly the right place. In a large telescope, like the Palomar 200-inch telescope, astronomers sat in a cage at the top of the telescope, where the secondary mirror is located, as shown in Figure 6.6. Assume for the purpose of your calculation that the diameter of this cage was 40 inches. What fraction of the light is blocked? Figure 6.6 Focus Arrangements for Reflecting Telescopes. Reflecting telescopes have different options for where the light is brought to a focus. With prime focus, light is detected where it comes to a focus after reflecting from the primary mirror. With Newtonian focus, light is reflected by a small secondary mirror off to one side, where it can be detected (see also Figure 6.5). Most large professional telescopes have a Cassegrain focus in which light is reflected by the secondary mirror down through a hole in the primary mirror to an observing station below the telescope.arrow_forward
- What kind of visible-light and infrared telescopes on the ground are astronomers planning for the future? Why are they building them on the ground and not in space?arrow_forwardMany decades ago, the astronomers on the staff of Mount Wilson and Palomar Observatories each received about 60 nights per year for their observing programs. Today, an astronomer feels fortunate to get 10 nights per year on a large telescope. Can you suggest some reasons for this change?arrow_forwardThe dean of a university located near the ocean (who was not a science major in college) proposes building an infrared telescope right on campus and operating it in a nice heated dome so that astronomers will be comfortable on cold winter nights. Criticize this proposal, giving your reasoning.arrow_forward
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