Diffraction grating interference

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Discussion Overview

The discussion revolves around the differences in the characteristics of diffraction patterns produced by diffraction gratings compared to those produced by double slit setups. Participants seek to understand the conceptual and mathematical aspects of why diffraction grating spots appear narrower.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant suggests that diffraction gratings allow for more opportunities for interference, which reinforces the peaks and narrows the spots.
  • Another participant expresses confusion, proposing that more slits might mean less opportunity for interference, indicating a misunderstanding of the underlying principles.
  • A link to a resource on resolving power is provided, suggesting that understanding this concept may help clarify the discussion.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus, as there are competing views regarding the role of interference in the formation of diffraction patterns from gratings versus double slits.

Contextual Notes

There may be missing assumptions regarding the definitions of interference and resolving power, as well as unresolved mathematical steps related to the comparison of the two setups.

Bengo
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Hello,

I'm having a hard time understanding why diffraction grating spots are narrower than those produced by a double slit set-up. I would really appreciate a conceptual understanding but math works too.

Thank you
 
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There is more opportunity for interference which will reinforce the peaks at the expense of the edges of the spots.
To get this properly you need to become more familiar with interference effects.
 
I thought there is less opportunity for interference since there are more slits. I've read more about interference but it's still not clicking with me
 

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