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What is the primary purpose of an astronomical telescope?
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The process occurring when photons bounce off a polished
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Astronomy

Test 1 (part 4)

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

 



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