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 thin lenqst.f 6g4az wjw (jq0(s. If a eo7dn:n 4s0l:mfj3d0ny /83lyl b ven virtual image forms at a distance of 50 cm from the lens, on the same sidldom dnf8l3n yse0j v3:ynb/e0n :7l4 e as the object, what is the 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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