Chromatic aberration occurs in a ________ telescope when __________.
a. reflecting; different colors of light do not focus at the same point
b. refracting; different colors of light do not focus at the same point
c. reflecting; light of different wavelengths get absorbed by the mirror
d. refracting; light of different wavelengths get absorbed by the lens
Question 2If two stars are emitting the same amount of light and are the same size, the star that is farther will appear
a. brighter.
b. dimmer.
c. redder.
d. bluer.
e. They will have the same brightness as seen from Earth.
Question 3The light-gathering power of a telescope is directly proportional to
a. the diameter of the primary mirror or lens.
b. the focal length of the primary mirror or lens.
c. the ratio of the focal lengths of its primary mirror or lens and its eyepiece.
d. the length of the telescope tube.
e. the diameter of the eyepiece.
Question 4From the mass-luminosity relation, a 2-solar-mass star on the main sequence would have a luminosity of approximately ____ solar luminosities.
a. 2
b. 4
c. 11
d. 0.5
e. 0.25
Question 5What statement below best describes the refraction of light?
a. The absorption of light as it travels through a dense, transparent material.
b. The spreading out of white light according to wavelength.
c. The change in direction of a light ray as it passes to a medium of different optical density.
d. The change in direction of a ray of light as it reflects off a surface.
Question 6If the orbital velocity of an eclipsing binary is 97 km/s and the smaller star is completely eclipsed in 2 hours, what is the diameter of the smaller star?
a. 175,000 km
b. 350,000 km
c. 194 km
d. 700,000 km
e. 4656 km
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