How can there be interference of light rays in Bragg's law

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Discussion Overview

The discussion revolves around the concept of interference of light rays in the context of Bragg's law, exploring how light scattered from atoms in a crystal can interfere with itself. The scope includes conceptual clarification and technical explanation related to wavefronts and scattering in crystallography.

Discussion Character

  • Conceptual clarification, Technical explanation

Main Points Raised

  • One participant notes that Bragg's law involves the path length difference between light rays that interfere after being scattered from atoms in a crystal.
  • Another participant questions how parallel scattered light rays can interfere with each other and where the interference occurs.
  • A different participant suggests that the representation of the ray is not a single line, indicating that a wavefront spreads perpendicular to the direction of movement.

Areas of Agreement / Disagreement

The discussion contains questions and clarifications, with no consensus reached on the nature of interference in this context.

Contextual Notes

Some assumptions about the nature of wavefronts and the conditions for interference may not be fully explored or defined.

tsopa
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As we know, Bragg's law is based on the path length difference between light which interfere with themselves after being scattered from atoms in the crystal.
If you google "Bragg's law", you will see numbers of pictures showing two light rays being scattered from two different atoms. Those two light rays are PARALLEL to each other.
How can those scattered light (which are parallel to each other) interfere with each other? And where does the interference happen?
 
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I got it. Nover mind :D
 
Please explain for me
 
yeah, this ray is not a single line. This line represents only the direction of movement of wave front. A wave front spreads perpendicular to that line.
 

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