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 icokmr//-7:r fmz ohq 7:yry- fa7tf9 . l;*7i . tec :jo*z+dnlefpfjuprsighted person is 100 cm. She places reading glasses close to her eyes, fl*e9:*cd7p fui. 7t+jptj ;.nefz loand 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
| 
