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telescopes - Lecture Outline Chapter 5 Telescopes You don't...

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Lecture Outline: Chapter 5: Telescopes You don’t have to know the different types of optical reflecting and refracting telescopes. It is important to understand the difference between “ imaging ,” photometry ,” and “ spectroscopy ” (sec. 5.2) before going any further. There are really only two topics here: light gathering power and resolution The latter involves the most considerations by far. Most of the variety in design and appearance of telescopes that employ different wavelengths is due to differing needs to attain high resolution at that wavelength. First: Make sure you understand what we mean by light gathering power (think of it as how many photons you can collect in a given time) and resolution (you learn resolution, try to put it into everyday language)
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Light gathering power —determines how faint an object you can detect. This will be proportional to the area of the collector, so D 2 where D is the diameter of the telescope. Read text on largest telescopes, future designs, etc. How much fainter a star can you see with a 6 meter telescope than a 2 meter telescope?
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