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 formed by using a p5+b, u5gcnweb,z9dl y .l*uxtiece of plastic (n = 1.70). The radius of lze.b,g 5b59tcduy u,* nxl+w 2wzj0x i1za dok4wu80iihriy v*),f.the front surface is 20 cm and the radius of the back surface is 30 cm. What is the focal length 0wf x ri1*)vd jui4,y.8kowz2ha0iz i 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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