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Unformatted text preview: Chapter 6. Telescopes: Portals of Discovery This chapter focuses on telescopes and their uses. Note that, although these instruments are fundamental to modern astronomy, most of the material in this chapter is not prerequisite to later chapters. Thus, you can consider this chapter to be optional. As always, when you prepare to teach this chapter, be sure you are familiar with the relevant media resources (see the complete, section-by-section resource grid in Appendix 3 of this Instructor Guide) and the online quizzes and other study resources available on the MasteringAstronomy Website. Teaching Notes (By Section) Section 6.1 Eyes and Cameras: Everyday Light Sensors As with all the chapters in Part II, we begin this chapter with a section on everyday light collection, discussing the human eye and cameras. Section 6.2 Telescopes: Giant Eyes This section describes the general design of optical telescopes. Note our emphasis on two principal properties of telescopes: light-collecting area and angular resolution. Note that while we show Cassegrain, Newtonian, and Nasmyth/Coudé foci in a figure, we do not expect students to learn the names, and we give the names only for reference. Although different observers tend to categorize observations differently, we have chosen to categorize observations as either imaging, spectroscopy, or timing. We believe that this categorization is pedagogically useful, because it most closely corresponds to the figures that students see in the book and in news reports: photographs (imaging), spectra (spectroscopy), and light curves (timing). Section 6.3 Telescopes and the Atmosphere In this section, we turn to the atmospheric effects due to light pollution and turbulence (twinkling), leading to a discussion of how observing sites are chosen and of adaptive optics. This is where we point out that most wavelengths of light do not penetrate the atmosphere, and introduce the rationale for space telescopes. Section 6.4 Telescopes and Technology This section covers telescopes designed to collect light of different wavelengths, and interferometry. 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley 1 Answers/Discussion Points for Think About It/See It For Yourself Questions The Think About It and See It For Yourself questions are not numbered in the book, so we list them in the order in which they appear, keyed by section number. Section 6.1 (p. 182) The pupil will be wider in the eye exposed to light. Doctors dilate your pupils so that they can see through them into your eye. (p. 183) This question is intended simply to get students to see the correspondence between the ideas they are learning in this chapter and the cameras that they use at home. ...
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