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In telescope formulas, what do fₒ and fₑ usually represent?
A. fₒ: Eyepiece focal length; fₑ: Objective focal length.
B. fₒ: Objective diameter; fₑ: Eyepiece diameter.
C. fₒ: Telescope length; fₑ: Eyepiece length.
D. fₒ: Objective focal length; fₑ: Eyepiece focal length.
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