# what is meaning of geometrical shadow???

A geometrical shadow is the set of points, where drawing a line between points on the shadow and the source always in the line intersecting the corresponding point on the object (obstacle) , or the shadow of the object without any diffraction at the corners.

Let AB be an obstacle towards a source of light. So the area ABC is a geometrical shadow because if we consider a point P on the region ABC and try to draw a line to the source of light, we must intersect AB the obstacle.

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That region which a given type of radiation would not reach, because of the presence of an object, if the effects of diffraction and interference could be neglected.

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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 possess in the absence of diffraction
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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 possess in the absence of diffraction.

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The shadow that forms in absence of diffraction .

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