関連ワード:  focal length of convex lens is always negative or positive    focal length of concave lens is always negative or positive    focal length of convex lens is negative or positive    focal length of convex lens is taken negative or positive    focal length of concave lens is negative or positive    focal length of converging lens is negative or positive    focal length of convex concave lens is negative or positive    focal length of convex mirror and convex lens is negative or positive    why focal length of convex lens is negative    why focal length of convex lens is positive  
結果 : focal length of convex lens is always negative or positive
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