All of the following statements are correct except:
- AThe total length of an astronomical telescope is the sum of the focal lengths of its two lenses.
- BThe image formed by the astronomical telescope is always erect because the effect of the combination of the two lenses is divergent.
- CThe magnification of an astronomical telescope can be increased by decreasing the focal length of the eye-piece.
- DThe magnifying power of the refracting type of astronomical telescope is the ratio of the focal length of the objective to that of the eye-piece.
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