In X-ray diffraction, what is the virtual source?

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In X-ray diffraction, the virtual source refers to the apparent origin of the X-rays as inferred from the direction of the diffracted beam. It is distinct from the real source, which generates the incident beam. The concept of a virtual source is borrowed from optics, where it represents a point from which light appears to emanate. The virtual source is positioned where the diffracted beam seems to originate when extended backward. Understanding this distinction is crucial for interpreting diffraction patterns accurately.
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In X-ray diffraction, during the experiment a X-ray beam will create an incident and diffracted beam, but what exactly is the virtual source? I may be mistaken but isn't the source the incident beam, in the attached image, it seems to suggest otherwise?
 

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I expect that they are borrowing the concept from optics. The virtual source is the apparent source ie. An xray source. located where the xrays appear to be coming from if one extended the diffracted beam back . The incident beam comes from the real source.

AM
 

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