In Fraunhofer diffraction area, the spot center is light spot, around encircle light and dark ring.

在夫琅和费衍射区域内，光斑图像中央是亮光斑，周围环绕着明暗交替的圆环。

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In Fraunhofer diffraction area, the spot center is light spot, around encircle light and dark ring.

在夫琅和费衍射区域内，光斑图像中央是亮光斑，周围环绕着明暗交替的圆环。

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