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 a th 6k47bthj*en lu+m*.l1:djm ih5gngqin lens. If a9tq nvc)r 0+zcfb7qtdv+fvi*op.itki-u +* 4 virtual image forms at a distance of 50 cm from the lens, on the same side as the object, what is theqk+it nc 4iizv dp9*v0fb*t+fqrct7-. v +u )o focal length of 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:
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