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Focal length means the vertical distance between ______ of the convex mirrors when the subjects which are infinitely far away project a clear image on the focal surface. A: Focus B: Optical Center C: Lens Center D: Physical Center

Focal length means the vertical distance between ______ of the convex mirrors when the subjects which are infinitely far away project a clear image on the focal surface.
A、 Focus
B、 Optical Center
C、 Lens Center
D、 Physical Center

发布时间:2024-09-07 07:30:26
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