本题目来源于试卷: Physics Unit25: Optical Instrument，类别为 Generic Physics
[单选题]
The near point of a farsightedw j7 wi4yyk4k5 persj elfj,dnyr/63* 6 qjion is 100 cm. She places reading glasses close to her eyes, and with them she can comfortably read/in q6ej3j6rd, f*lj y a newspaper at a distance of 25 cm. What lens power is required?
A. +2.5 D
B. +3.0 D
C. +3.2 D
D. -2.0 D
参考答案: B
本题详细解析:
暂无
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Post time 2024-1-26 22:03:25