関連ワード:  convex mirror focal length is always negative    convex mirror focal length is always negative or positive    convex mirror focal length is positive or negative    concave mirror focal length is always negative    concave mirror focal length is always negative or positive    concave mirror focal length is positive or negative    convex mirror focal length distance is positive or negative    convex mirror focal point positive or negative    in concave and convex mirror focal length is positive or negative    in case of concave mirror focal length is positive or negative  
結果 : convex mirror focal length is always negative
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