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Author Question: The most common stars are a. supergiants. b. giants. c. upper (more luminous) main-sequence ... (Read 109 times)

charchew

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on: Jul 27, 2018
The most common stars are
 
  a. supergiants.
  b. giants.
  c. upper (more luminous) main-sequence stars.
  d. white dwarfs.
  e. lower (less luminous) main-sequence stars.

Question 2

An achromatic lens
 
  a. is used to correct spherical aberration in reflecting telescopes.
  b. is used to correct chromatic aberration in refracting telescopes.
  c. is used to correct spherical aberration in refracting telescopes.
  d. is used to correct chromatic aberration in reflecting telescopes.
  e. contains two mirrors and focuses the light back through the primary mirror.


CharlieArnold

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Reply #1 on: Jul 27, 2018
Answer to Question 1

e

Answer to Question 2

b


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