Test 1 (part 4)
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| What is the primary purpose of an astronomical telescope? | To collect a lot of light and bring it to a focus.
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| The process occurring when photons bounce off a polished surface is called: | reflection
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| Which type of telescope has the simplest light path? | prime focus reflector
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| Which design is subject to chromatic aberration? | refractor
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| What problem do refractor telescopes have that reflectors don't? | chromatic aberration
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| A major advantage of a Newtonian reflector over a refractor is: | the elimination of chromatic aberration
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| Why are most large telescopes reflectors not refractors? | (all of the above)
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| The convex secondary mirror in this design focuses light down through a hole cut in the concave primary mirror. | Cassegrain reflector
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| The angular resolution of an 8 inch diameter telescope is ________ greater than that of a 2-inch diameter telescope. | 4 times
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| What is the resolution of a telescope? | its ability to distinguish two adjacent objects close together in the sky
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| What type of telescope is the Subaru telescope (shown below) | Cassegrain reflector
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| What type of telescope is the Hubble Space Telescope? | Cassegrain
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| The most important advantage of CCDs over film is that: | they record much more light in a given exposure time.
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| What problem does adaptive optics correct? | turbulence in the earth's atmosphere which creates twinkling
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| The Arecibo radio telescope is laid out like which optical telescope design? | prime focus reflector
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| Which of the following is a problem inherent in all large radio telescopes? | Radio waves have long wavelengths, so radio telescopes have poor resolution
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| Which of the following greatly improves the angular resolution of radio maps? | use of interferometers
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| The design of modern X-ray telescopes depends on: | grazing incidence optics
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| It is much easier to build large reflectors than large refractors. | True
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| The primary purpose of an astronomical telescope is to magnify the images of distant objects, making them appear closer | False
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| The light gathering ability of a telescope is most dependent on the diameter of its primary objective. | True
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| One reason for building telescopes on mountain tops is that they improve seeing by reducing the amount of air above the observer. | True
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| Optical telescopes are usually used only at night, but radio telescopes can be used day or night. | True
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| Radio telescopes have poorer angular resolution than optical telescopes because radio waves have a much longer wavelength than optical waves. | True
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| All radio telescopes are reflectors in design. | True
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| Optical interferometry is more in use than radio interferometry. | False
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| In addition to the visible light, hubble can do some work in the infrarred and ultraviolet portions of the spectrum | True
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| Due to our ozone layer, ultraviolet astronomy must be done from space. | True
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| Galaxies look the same whether viewed in visible or X-ray wavelengths. | False
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