Physics Unit23: Light and Geometric Optics (id: d1f1775ac)

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]
A concave mirror with a radius of 20 cm createxla 1+p08h bkms a reabhnuk7 h b5(a0l image 30 cm from the mirror0b 7bkhhn( ua5. What is the object distance?

A. $20 \; cm$
B. $15 \; cm$
C. $7.5 \; cm$
D. $5.0 \; cm$


参考答案:  B


本题详细解析: 暂无

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