Order of Diffraction Explained: Animation & Detailed Explanation

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Discussion Overview

The discussion centers on the concept of the order of diffraction, particularly in the context of constructive interference in optical systems. Participants seek clarification and resources to better understand this phenomenon.

Discussion Character

  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • One participant expresses confusion about the meaning of the order of diffraction and its relation to constructive interference.
  • Another participant explains that diffraction order can refer to multiple concepts, particularly in dispersive optical systems where light is split into different orders due to the nature of the scattering problem.
  • A third participant provides a simplified explanation stating that constructive interference occurs when the path difference of adjacent rays is an integer multiple of the wavelength, indicating that this multiple defines the order.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the initial confusion expressed, but there are multiple explanations provided regarding the order of diffraction and constructive interference.

Contextual Notes

Some assumptions about the definitions of terms like "order" and "constructive interference" may not be fully clarified, and the discussion does not resolve the initial participant's confusion.

dima_tr
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Hi.

I cannot understand what the order of diffraction means.

Could anybody give me some link with animation or detailed explanation?

I do not understand why it should be integer to create constructive interference?
 
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Diffraction order can refer to a couple concepts. In dispersive optical systems (e.g. a spectrometer), light diffracting off a grating is split into multiple orders (or rainbows) because if sin(x) is a solution to the scattering problem, so is sin(2x) and sin(3x), etc.

Section 2.2 may be relevant to you:
http://gratings.newport.com/information/handbook/chapter2.asp
 
Last edited by a moderator:
A simple answer is: to have constructive interference, the path difference of adjacent "rays" must be an integer multiple of the wavelength. Whatever that multiple is, is the order.

See http://www.cdli.ca/courses/phys2204/unit04_org02_ilo15/b_activity.html , which has this figure:

[PLAIN]http://www.cdli.ca/courses/phys2204/unit04_org02_ilo15/les-14-01.gif[/CENTER]

p.s. Welcome to Physics Forums, dima_tr​
 
Last edited by a moderator:
Thanks a lot.

It appears to be really simple :)
 

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