本题目来源于试卷: Physics Unit25: Optical Instrument,类别为 Generic Physics
[单选题]
A person is designing wn8anw.b7ky)/.p3j d8q e 3zn,aqcdja 1); lqpl6g- dxz26e dwe0X telescope. If the telescope is limited to a length of 20 cm, what is the approxeldz6p6w2g;x -q )delimate focal length of the objective?
A. $16 \; cm$
B. $17 \; cm$
C. $18 \; cm$
D. $19 \; cm$
参考答案: C
本题详细解析:
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