Physics Unit23: Light and Geometric Optics (id: af027c99e)

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]
When an object is placed 60 cm ft cxtz/ar 4o.xc/er19rom up( )6fyhb6hua converging lens, it forms a real image. When the object is moved to 40 cm from the lens( h6pu f6buh)y, the image moves 10 cm farther from the lens. What is 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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