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chapter21b questions and answers already passed 2024
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chapter 6Which of the following is a principal advantage of CCDs over photographic
film?
CCDs allow long exposures (e.g., minutes or hours), and film does not.
CCDs can be attached to modern telescopes more easily than cameras.
CCDs capture a much higher percentage of the incoming photons than does
film.
CCDs can record the colors of astronomical objects accurately, while film
cannot.
Images recorded with CCDs never require any image processing, while
images recorded by film often do. - correct answer ✔CCDs capture a much
higher percentage of the incoming photons than does film.
Which of the following statements about light focusing is not true?
In a healthy eye, light is focused on the retina.
The focal plane of a reflecting telescope is always located within a few inches
of the primary mirror.
Film should be placed at the focal plane in a camera.
Light can be focused with a lens or a mirror.
If you try to look at an image that is not formed at the focal plane, it will be
blurry. - correct answer ✔The focal plane of a reflecting telescope is always
located within a few inches of the primary mirror.
The lens in your eye forms an upside-down image of the world.
, True
False - correct answer ✔true
Currently, the largest optical telescope mirrors have a diameter of
2 m.
100 m.
10 m.
5 m.
1 m. - correct answer ✔10 m
What do we mean by the diffraction limit of a telescope?
It is the maximum size to which any telescope can be built.
It is the best angular resolution the telescope could achieve with perfect
optical quality and in the absence of atmospheric distortion.
It describes the farthest distance to which the telescope can see.
It describes the maximum exposure time for images captured with the
telescope. - correct answer ✔It is the best angular resolution the telescope
could achieve with perfect optical quality and in the absence of atmospheric
distortion.
The angular resolution of a telescope is never less than its diffraction limit.
True
False - correct answer ✔true
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