Physics Unit23: Light and Geometric Optics (id: 8a376a996)

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]
Two very thin lenses, each with focal length 20 oieyyc )68ilq6ld(u tj qhq/4w(*d u l6+d.ym( 0jxjb:lyex+ cm, are placed in contact. What is the focal length of this compound lebe x+x: jljy(0ns?

A. $40 \; cm$
B. $20 \; cm$
C. $15 \; cm$
D. $10 \; cm$


参考答案:  D


本题详细解析: 暂无

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