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