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Exam 6: Light and Telescopes

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Question 31

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Which type of focus is most common for larger telescopes?

A) Cassegrain focus
B) Galilean focus
C) Newtonian focus
D) Copernican focus
E) Schmidt-Cassegrain focus

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Question 32

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Explain interferometry and provide an example of an observatory that uses this technique.

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Astronomers have been able to achieve ve...

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Question 33

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Optical telescopes are intended for the study of _______________ light.

The energy a photon carries is inversely proportional to __________.

Visible light with wavelengths at the long-wavelength end (λ  = 700 nm) appears as which color?

Refracting and reflecting telescopes form an image that is small, inverted, and difficult to observe directly; therefore, an eyepiece is normally used to magnify the image and make it convenient to view.

Jenny, who lives on a farm in a rural part of New York, calls her cousin, Karen, in Brooklyn, to tell her that she can see the Milky Way in tonight's night sky. However, Karen says she can't see it at all.  What is preventing Karen from seeing the Milky Way in the night sky?

The Very Large Array radio telescope in New Mexico is an example of the use of which astronomical technique?

Why are reflecting telescopes cheaper to build than refracting telescopes?

Two devices that spread white light into a spectrum are __________ and __________.

What does chromatic aberration separate within refracting telescopes?

The larger the diameter of a telescope, the more light it will collect.

It is a common misconception that the purpose of an astronomical telescope is to _______________ images .

Which telescope will be launched into solar orbit and eventually replace observations made by the Hubble Space Telescope?

Refracting telescopes use a mirror to gather and focus light.

A lens called the _______________ is typically used to magnify the image and make it convenient to view distant objects.

A optical distortion of refracting telescopes called _______________ causes a separation of colors, such as when you focus on one color, the other colors in an image are blurred.

Figure 6-1 In the above image (Figure 6-1) , what part of the telescope is represented by the pointer?

Space-based telescopes carrying long-wavelength infrared detectors must carry coolant such as liquid helium to chill their optics to near absolute zero temperature.

Where would you most likely find a large radio telescope?