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 formedbc( 6 t/mzwhbl7fwe:; by using a piece of plastic (n = 1.79 p26zmlp+e (9l bcijurkd6h,0). The radius of the front surface is 209 i+ pembldlrkpcj 662z,9hu ( 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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