Fresnel diffraction; geometrical shadow

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j-lee00
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What is geometrical shadow qualitatively? please don't refer me to hyper physics
 
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A geometric shadow is a set of points (or a region of space) where drawing a line between said points and a source always results in the line intersecting some obstacle.

A looser explanation would be that a geometric shadow is the shadow objects would possesses in the absence of diffraction.

Claude.
 

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