阿摩線上測驗
登入
阿摩線上測驗
登入
試卷名稱：113年 - 113 國立清華大學學士後醫學系單獨招生考試_學士後醫學系/智慧資訊科技組:資訊科學#119923
年份：113年
科目：學士後西醫◆資訊科學
4. Two thin lenses form a compound lens system. The front focal length (FFL) of this compound lens system is defined as the distance between a point source and the front lens so that the light passing this system will become parallel. In the figure, the two lenses have focal length f1 = 10 cm and f2 = -10 cm, respectively, and are separated by a distance d = 5 cm. What is the FFL of this compound lens system?
(A) 5 cm
(B) 10 cm
(C) 12.5cm
(D) 25 cm
(E) 30 cm
