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如图,在凸透镜的二倍焦距处斜放一发光日光灯,在透镜右边将一光屏沿着主光轴向外移动,问在光屏上可看到什么现象.此日光灯我们可以把它看作是由无数点光源组成.在日光
As shown in the figure, a fluorescent lamp is placed obliquely at the double focal length of the convex lens, and a light screen is moved along the main optical axis on the right side of the lens. What kind of phenomenon can be seen on the screen? This fluorescent lamp can be seen by it. The work consists of numerous point light sources.