25 terms

Astronomy Quiz #4 Telescopes

What is the primary purpose of an astronomical telescope?
To collect a lot of light and bring it to a focus.
The tendency of a wave to bend as it passes from one transparent medium to
another is called:
What problem do refractor telescopes have that reflectors don't?
chromatic aberration
Why are most large telescopes reflectors, not refractors?
All of these are correct
Which design has a convex primary mirror and flat secondary mirror, with the eyepiece located on the top side of the telescope tube?
Newtonian reflector
The amount of diffraction and thus the resolution of the scope depends upon
the wavelength used and the size of the main telescope objective lens or mirror.
The angular resolution of an 8 inch diameter telescope is _______ greater than that of a 2 inch diameter telescope.
It is diffraction that limits the ________ of a telescope's objective.
What is the resolution of a telescope?
its ability to distinguish two adjacent objects close together in the sky
What is the resolving power of the telescope?
the ability to distinguish adjacent objects in the sky
Which method of astronomical measurement is the precise measurement of brightness?
A telescope with a 60 mm objective lens collects how many times as much light as does your eye's 6 mm exit pupil?
What are two advantages of large scopes over smaller ones?
Large telescope have more light grasp and better resolution.
What type of telescope is the Hubble Space Telescope?
What is true of radio telescopes?
They have poorer angular resolution than a refractor.
Radio dishes are large in order to:
increase their angular resolution and collect the very weak radio photons.
This design combines the radiation from two different telescopes to greatly enhance resolution via computer synthesis.
In which part of the electromagnetic spectrum have astronomers been unable to get any information?
We now can access information in all spectral lengths.
The design of modern x-ray telescopes depends on
grazing incidence optics.
The name of the new Infrared Orbiting Observatory is the:
Spitzer Space Telescope.
The most important advantage of CCDs over film is that
they record much more light in a given exposure time.
Green light has a shorter wavelength than orange light. In a 5 inch telescope, green light will
provide better angular resolution than orange light.
A mountain top is an especially good site for infrared telescopes since:
All of these are factors.
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