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In the context of a telescope, what do the symbols fₒ and fₑ usually represent?
A. fₒ: Focal length of the eyepiece; fₑ: Focal length of the objective.
B. fₒ: Diameter of the objective; fₑ: Diameter of the eyepiece.
C. fₒ: Focal length of the objective; fₑ: Focal length of the eyepiece.
D. fₒ: Length of the telescope; fₑ: Length of the eyepiece tube.
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