學士後西醫物理及化學題庫下載題庫

57. The focal length of a spherical, concave mirror is 8 cm. An object is placed at a distance of 24 cm in front of the mirror. How fast does the image move if the object starts to move at speed toward the concave mirror?
(A)
(B) 0.50
(C) 0.25
(D) 0.20
(E) 0.18