本题目来源于试卷: Physics Unit23: Light and Geometric Optics，类别为 通用国际物理
[单选题]
An object is placed at a distance of 40 cm from tl h -6xaqr ypj6 eo,q3lr2)r1a tch-0ei 7k i/y4+2gqma wm;zy znk2y8l hin lens. If a virtual image forms at a distance of 50 cm from the lens, on the same side as the object, what is the focal length oi 8ney/gh22m-7icwz0zk m;ylaq + y4k f the lens?
A. $45 \; cm$
B. $75 \; cm$
C. $90 \; cm$
D. $200 \; cm$
参考答案: D
本题详细解析:
暂无
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