阿摩線上測驗
14. An object is 12 cm in front of a concave spherical mirror, and the image is 3 cm in front of the
mirror. What is the focal length of the mirror?
(A) 0.25 cm
(B) 1.5 cm
(C) 2.4 cm
(D) 4 cm
(E) 13 cm
答案：登入後查看
統計： A(2), B(0), C(20), D(4), E(0) #3101765
統計： A(2), B(0), C(20), D(4), E(0) #3101765
