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 biconvex lens is formedk.in*u0es a+li zm+2 s by using a piece of plastic (n = 1.70).w o/d m q4 ;wv-,umfe )arp796qrafzs: The radius of the fr;f)-zouq w9r damv 7 f:ae/6sm, p4wrqont surface is 20 cm and the radius of the back surface is 30 cm. What is the focal length of the lens?
A. $17 \; cm$
B. $86 \; cm$
C. $-86 \; cm$
D. $-17 \; cm$
参考答案: A
本题详细解析:
暂无
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