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tamasflex

12 Noi 2009 07:32


Distanta focala

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Am gasit problema de mai jos la un forum australian de astronomie:

Join Date: Apr 2008
Find the focal length of the telescope's objective lens.?
Mars subtends an angle of 8.0 10-5 rad at the unaided eye. An astronomical telescope has an eyepiece with a focal length of 0.037 m. When Mars is viewed using this telescope, it subtends an angle of 3.10 10-3 rad. Find the focal length of the telescope's objective lens.

Oare cit o sa fie distanta focala a obiectinului??