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Author Question: In a reflecting telescope the objective is a ____. a. prism b. mirror c. lens d. diffraction ... (Read 108 times)

sarasara

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on: Jul 27, 2018
In a reflecting telescope the objective is a ____.
 
  a. prism
  b. mirror
  c. lens
  d. diffraction grating
  e. photographic plate

Question 2

A planetary nebula has a radius of 0.5 pc and is expanding at 20 km/sec. What is the approximate age of this planetary nebula? (1 pc is equal to 3 x 1013 km and 1 year is equal to 3.15 x 107 seconds.)
 
  a. 240 years
  b. 790,000 years
  c. 96,000 years
  d. 960 years
  e. 24,000 years


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isabelt_18

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

B

Answer to Question 2

E


sarasara

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Reply 2 on: Jul 27, 2018
Thanks for the timely response, appreciate it

recede

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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Andromeda as depicted in Urania's Mirror, set of constellation cards published in London c.1825 Andromeda as depicted in Urania's Mirror, set of constellation cards published in London c.1825
Mirror Reflection Mirror Reflection
Lens of eye Lens of eye
Bill Viola, The Reflecting Pool. Bill Viola, The Reflecting Pool.
Mirror Mirror
Refracting Telescope Refracting Telescope
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