题目内容

已知两狭缝间距0.3mm，屏间距为50cm，入射光波长为600nm，第二、三级暗条纹之间的间距为（）

A. 1mm
B. 2mm
C. 3mm
D. 4mm

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由单球面折射公式可知，物距一定，球面的曲率半径变大，则（）

A. 焦度增大，像距增大
B. 焦度增大，像距变小
C. 焦度变小，像距增大
D. 焦度变小，像距变小

正常人眼视近物的调节主要是通过（）

A. 增大角膜的曲率
B. 减小角膜的曲率
C. 减小晶状体的曲率
D. 增大晶状体的曲率

屈光度为2.5D的薄透镜的焦距为（）

A. 0.4m
B. 0.1m
C. 2.5m
D. 0.2m

[音频]Instead, I visited the writing 1__ — there is one in every 2 residential hall — for every paper I 3_. My papers were always written days before they were 4. I 5_ after classes to question professors. My classmates lent me their notes so I could learn the skill of note-taking in English.