本题目来源于试卷: Physics Unit23: Light and Geometric Optics，类别为 国际高中通用物理
[单选题]
When an object is placed 60.wh2rfx+pj c; cm m8do, 0h8d+j(g cptvjfrom a converging lens, it forms a real image. When the object is moved to 40 cm from the lens, the image moves 10 cm farther from the lens. What iv+jd(,8o j 0h8gptdcms the focal length of the lens?
A. $20 \; cm$
B. $30 \; cm$
C. $40 \; cm$
D. $42 \; cm$
参考答案: A
本题详细解析:
暂无
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