![]() For example, if a telescope has a focal length of 500 mm and a 25-mm eyepiece, then the magnification is 500/25, or 20×. This is simply the objective's focal length divided by that of the eyepiece, which you'll find on its barrel. ![]() The objective's focal length (F or FL) is the key to determining the telescope's magnification ("power"). Watch an animation of light passing through a compound telescope.
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