Ch. 6 Key Terms

Edit Answers
1234567891011121314151617
Across
  1. 5. unsteadiness of Earth’s atmosphere, which blurs telescopic images; good seeing means the atmosphere is steady
  2. 7. magnifying lens used to view the image produced by the objective lens or primary mirror of a telescope
  3. 9. distortion that causes an image to appear fuzzy when each wavelength coming into a transparent material focuses at a different spot
  4. 11. combination of multiple radio dishes to, in effect, work like a large number of two-dish interferometers
  5. 12. diameter of the primary lens or mirror of a telescope
  6. 16. systems used with telescopes that can compensate for distortions in an image introduced by the atmosphere, thus resulting in sharper images
  7. 17. instrument for collecting visible-light or other electromagnetic radiation
Down
  1. 1. telescope in which the principal light collector is a concave mirror
  2. 2. device sensitive to electromagnetic radiation that makes a record of astronomical observations
  3. 3. instrument that combines electromagnetic radiation from one or more telescopes to obtain a resolution equivalent to what would be obtained with a single telescope with a diameter equal to the baseline separating the individual separate telescopes
  4. 4. (of telescope) point where the rays of light converged by a mirror or lens meet
  5. 6. array of high-sensitivity electronic detectors of electromagnetic radiation, used at the focus of a telescope (or camera lens) to record an image or spectrum
  6. 8. process in which waves mix together such that their crests and troughs can alternately reinforce and cancel one another
  7. 10. telescope in which the principal light collector is a lens or system of lenses
  8. 13. point in a telescope where the objective lens or primary mirror focuses the light
  9. 14. detail in an image; specifically, the smallest angular (or linear) features that can be distinguished
  10. 15. technique of transmitting radio waves to an object and then detecting the radiation that the object reflects back to the transmitter; used to measure the distance to, and motion of, a target object or to form images of it