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1.根据焦距的大小判断成像情况根据焦距与物距的大小关系可知成虚实像的情况.若成实像,根据物距与二倍焦距的关系可知像的放缩情况.
1. According to the size of the focal length to judge the imaging situation According to the relationship between the focal length and the object distance can be understood as the situation of the virtual image. If the real image, according to the relationship between the object distance and the double focal length can know the zoom situation.