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一、推理法依据题干进行推理,抓住关键词推敲.例1有一物体从距凸透镜1.5倍焦距处沿主轴向透镜方向移动,当物距减小到原来1/2时,适当移动光屏,则在屏上()(A)得到比物体大的虚像(B)得到比物体大的实像(C)得到比物体小的实像(D)不能得到像
First, the reasoning method based on the subject of reasoning, to seize the key words.Example 1 an object from the convex lens 1.5 times focal length along the main lens to the lens direction, when the object distance reduced to the original 1/2, the appropriate movement of light (B) to get a larger real image than the object (C) to get a smaller real image than the object (D) can not get the image