题目

根据以下提示写一篇短文，介绍自己的家庭。father：doctormother：teacherbrother and I: studentsat weekends, go to park, sweet family 答案：I have a happy family. There are four people in it. They are my father, my mother, my brother and my father is a doctor and my mother is a teacher. My brother and I are students. At weekends we often go to the park. My parents love us very much, We love them too. This is my sweet family.如图所示，是探究凸透镜成像规律的实验装置，烛焰、透镜和光中心大致在同一高度，当凸透镜的焦距f=10cm、物距u=15cm、像距v=30cm时，光屏上得到_________、________ 的实像；若撤去光屏，简要说明观察该像的方法________