関連ワード:  focal length of concave lens is taken negative or positive    focal length of convex lens is taken negative or positive    focal length of concave mirror is taken negative or positive    focal length of convex mirror is taken negative or positive    why focal length of concave lens is negative    is focal length of concave lens positive    is the focal length of a convex lens negative  
結果 : focal length of concave lens is taken negative or positive
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