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I'm working on a project that refers to optics. the question says when a laser beam is aimed to a wire ( perpendicular to the surface ), a circle of light then will be seen on a the surface. I somehow know its explanation, but there's something I need to know. Dose Diffraction happen in this phenomenon?

Thanks in advance!

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At the end of your wire (any direction) we have diffraction but I think this question can;t be solve by diffraction . Just experiment it : If after glowing your light we have complete shadow in the back of the wire , we haven't diffraction but If not , we have that .

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