What is the origin of the strange shadow in a laser beam?

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SUMMARY

The discussion centers on the phenomenon known as Poisson's spot, which is observed when a laser beam is directed at a small object, such as a ball, resulting in a bright spot in the center of the shadow. This effect occurs due to the wave nature of light, where light waves bend around the object and interfere constructively at the center of the shadow. The reference to Arago's spot highlights its historical significance in the study of optics and wave behavior.

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paul-g
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Hello!

I have for you some questions about the lasers. When ordinary laser beam directed at a small ball (few millimeters) on the screen I saw a bright spot in the middle of the shadow. What it is due?
 
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