1. Chromatic aberration occurs when? a.a lens does not focus all colors of light
ID: 802882 • Letter: 1
Question
1. Chromatic aberration occurs when?
a.a lens does not focus all colors of light to the same place.
b.the Doppler shift causes a star to look redder or bluer than it really is.
c. a mirror does not focus all colors of light to the same place.
d. atmospheric scattering causes the Sun to look red at sunset.
2. Astronomers use adaptive optics to
a.keep rapidly moving objects within a telescope's field of view.
b. correct for blurring from Earth's atmosphere in real time.
c. remove cosmic rays from astronomical images.
d. observe in ultraviolet light, which is not usually visible from the Earth's surface.
3. Several radio telescopes are combined into an interferometer in order to
a.decrease the smallest angle which can be observed by the telescope.
b.decrease the strength of the signal transmitted.
c. allow the instrument to operate in any weather conditions.
d. observe over a narrower range of wavelengths.
4. Which of the following are benefits of using telescopes located in space compared to telescopes on Earth? (You may choose more than one answer.)
Telescopes in space cost less to build and maintain than telescopes on Earth.
Space telescopes avoid atmospheric distortion by functioning above the Earth's atmosphere.
Telescopes in space can observe wavelengths of light that are absorbed by Earth's atmosphere.
Space-based telescopes are easier to repair when something goes wrong.
5. What property of a reflecting telescope determines its light-gathering (or light-collecting) power?
a. longitude of telescope
b. type of telescope dome
c.primary mirror radius of curvature
d. diameter of mirror
Explanation / Answer
1.a lens does not focus all colors of light to the same place.
Note: Chromatic aberration(CA) occurs when a lens does not focus all colors of light to the same focal plane or different colors of light are focused at different places in the focal plane.
2.b. correct for blurring from Earth's atmosphere in real time.
Note: Astronomers are using adaptive optics to correct for blurring due to turbulence in the Earth's atmosphere in real time so that the images are clear as if they are taken in space.
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