本题目来源于试卷: Physics Unit25: Optical Instruments，类别为 国际高中通用物理
[单选题]
The near point of a f 1x)d4jo+;nxzcg ww. t2j 4/y/s kxobvua j,v bkk:ixmg35*) harsighted person is 100 cm. She places reading glasses closebu hxy j 5)i,2/bkgxkv*o 4:vksj/a3 m to her eyes, and with them she can comfortably read 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
| 
