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Diffraction in crystal This is a image of diffraction in crystal. My doubt is how the parallel waves coming out interfere if they are seperate?

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  • $\begingroup$ Possible duplicate "Does interference take place only in waves parallel to each other?"physics.stackexchange.com/q/107286 $\endgroup$ – sammy gerbil Jun 12 '16 at 11:20
  • $\begingroup$ I already read that question but my question is different almost completely from that. $\endgroup$ – PremVijay Jun 12 '16 at 18:26
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In answering your question, a lot could be said about the art of mathematical modeling, but, the short answer is: They don't.

But, the rays in the scheme are only an approximation, and one that fails at the atomic scale - a beam of light, no matter how laser like or faint, is never exactly a 1-D mathematical line, it spreads sideways. That's why they can interfere.

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