Fresnel diffraction; geometrical shadow

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SUMMARY

The discussion clarifies the concept of geometrical shadow, defining it as a set of points or a region where a line drawn from a light source to those points intersects an obstacle. This definition emphasizes that a geometrical shadow represents the shadow objects would cast without the influence of diffraction. The explanation provided by Claude serves to distinguish geometrical shadows from other shadow phenomena.

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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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