関連ワード:
focal length in concave lens is positive or negative focal length in convex lens is positive or negative focal length in concave mirror is positive or negative focal length in concave lens is always positive or negative focal length in convex mirror is positive or negative focal length in diverging mirror is positive or negative focal length of concave lens is positive or negative class 10 focal length in concave mirror is always positive or negative focal length in convex lens is always positive or negative focal length of plano concave lens is positive or negative
