探究凸透镜成像规律的现象和数据如表:(单位:cm)
序号
焦距
物距
像距
像的正倒
①
14
20
47
倒立
④
16
80
②
30
26
⑤
34
③
40
22
⑥
27
一I think I've got a bad cold,Doctor.Shall I take some medicine?
一No need.Your body itself is able to the virus. Just drink more water and rest.