针对扩展光源条件下的迈克耳孙干涉图样提出了一种新的分析方法.扩展光源发出的光，由于两反射镜的反射，存 在对应光源的两个虚像，这两个虚像发出的光在光屏上的干涉与原光源发出的光经过分束镜、反射镜之后在光屏上形成等效 的干涉.通过这种解释，可以更加清晰地理解实验过程中出现的圆、椭圆、曲线、直线等各种条纹.

A new theoretical explanation is proposed for the Michelson interference pattern under the extended light source.The light emitted by the extended light source，due to the reflection of the two mirrors，there are two virtual images of the corresponding light source.The light emitted by the two virtual images is transmitted on the screen with the light from the original light source through the beam splitter，the screen forms an equivalent interference.Through this interpretation，we can more clearly understand the process of the process of the circle，oval，curve，straight lines and other stripes.