ASTRONOMY: An optical instrument is required to observe stars beyond the sixth

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phuonganh_dethuong158

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magnitude, the limit of ordinar? ASTRONOMY: An optical instrument is required to observe stars beyond the sixth magnitude, the limit of ordinary vision. However, even optical instruments have their limitations. The limiting magnitude L of any optical telescope with lens diameter D, in inches, is given by

L= 8.8 + 5.1 log D

(A) Find the limiting magnitude for a homemade 6-inch reflecting telescope.

(B) Find the diameter of a lens that would have a limiting magnitude of 20.6

Compute answers to 3 significant digits
 
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