日常生活中的夫琅禾费衍射现象与教学实践

Daily Fraunhofer Diffraction Phenomenon and Teaching Practice

大学物理教学实践中,光的衍射因为概念相对抽象,理论分析较多,成为光学部分的教学难点。但笔者发现,如果能将光的衍射与日常生活实践相结合,设计简单实验,并对其原理进行简单分析、对其应用领域进行拓展,能充分激发学生学习兴趣,大大提高教学效果。文章以光的夫琅禾费衍射知识点的教学实践为例,设计了测量数码相机镜头分辨率的实验,并讨论了夫琅禾费衍射对Google Earth卫星成像系统的影响,取得了不错的教学效果。

In college physics teaching practice, the light diffraction section, due to its relatively abstract concept and complex theoretical analysis, becomes a difficult knowledge point of optics section. However, the authors found that if we can combine this knowledge point with daily life, design some simple experi ments, do some simple principal analyses, and expand its application field, the students＇ learning interest can be fully activated, which will greatly enhance the effectiveness of teaching. In the paper, Fraunhofer light diffraction is taken as an example of teaching practice, a experiment which meaures resolution of dig- ital camera lens is designed, and the impact of Fraunhofer diffraction to the Google Earth satellite imaging system is discussed, resulting in good teaching effect eventually.