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郑州市第八中学张溟同学问:“手指在幻灯机或投影机光源(白光)的照射下,显示在屏幕上手指阴影的边缘为什么显现出彩色?”上述现象无法用几何光学理论来解释,因为几何光学认为光在空间是沿直线传播的,屏幕上手指阴影的边缘不应该出现彩色.上述现象属于光的衍射现象,说明光在空间传播遇到障碍物(例如上述的手指)时,光不再沿直线传播了.例如,让一个发出白光的点光源S照射一个圆孔
Zhang Ming, an Eighth Middle School student in Zhengzhou, asks: “Why does the finger color appear on the screen when the finger is touched by a projector or projector light source (white light)?” The above phenomenon can not be explained by the theory of geometrical optics Geometrical optics believes that light propagates along a straight line in space, and the edge of the finger shadow on the screen should not appear in color. The above phenomenon belongs to the phenomenon of light diffraction, indicating that when light propagates in space encountering an obstacle (such as the above-mentioned finger), the light does not For example, let a point light source S that emits white light irradiate a circular hole