Why are there points of zero intensity in the single slit experiment?

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Discussion Overview

The discussion centers on the phenomenon of zero intensity points observed in the single slit diffraction experiment. Participants explore the relationship between diffraction angle and intensity, as well as the implications of slit width on light distribution. The conversation includes inquiries about the underlying reasons for these intensity patterns and the role of interference.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant notes that as the diffraction angle increases, the intensity decreases, leading to points of zero intensity in the projected image.
  • The same participant questions whether the zero intensity points are related to light interfering with itself as it passes through the slit.
  • Another participant suggests that interference is indeed the cause of the observed intensity patterns and provides a link to a resource for further explanation.
  • There is a mention of the double-slit experiment, with one participant suggesting it is conceptually easier than the single slit experiment and that the mathematics involved is more complex for the latter.
  • One participant expresses confusion over the usernames in the discussion, indicating a light-hearted side conversation unrelated to the main topic.

Areas of Agreement / Disagreement

Participants generally agree that interference plays a role in the phenomenon being discussed, but the exact mechanisms and implications remain unclear. There is no consensus on the complete explanation for the zero intensity points.

Contextual Notes

Some participants note that the discussion is occurring in the context of a classroom setting where the single slit experiment is being taught, and there may be limitations in their understanding due to the order in which experiments are presented.

Who May Find This Useful

Students learning about diffraction and interference in optics, educators seeking to clarify concepts related to the single slit experiment, and individuals interested in the foundational principles of wave behavior in light.

_Mayday_
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Today in class we went over the single slit experiment, the aim of the lesson was to see that the greater the diffraction angle the lower the intensity. We then looked at a graph where it showed along the x-axis the angle of diffraction and up the y-axis the intensity. There was a decrease in the intensity as the angle of diffraction increased, and there were points at which the intesnsity was zero along the x-axis, this was seen by there being gaps in the projected image. We then went on to discuss how the width of the slit affects the intensity.

My question is why? Why are there points where there is zero intensity and is there anything else that explains the distribution of light? Is it to do with the light going through the slit and somehow the light interfering with itself? I am really not sure, and it is not in the course. Could someone please explain it, or if you prefer provide a link that explains it.

Any help would be much appreciated. :biggrin:

_Mayday_
 
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Thanks Kurdt! :smile:
 
In school you should have begun with the double-slit experiment. That appears to be more grasp than the single slite one. Mathematics for the singleslit are slight more difficult than those fore the doubleslit.
 
ManDay said:
In school you should have begun with the double-slit experiment. That appears to be more grasp than the single slite one. Mathematics for the singleslit are slight more difficult than those fore the doubleslit.

We are learning about Diffraction in the lesson and so the single slit experiment was used as an example. We work our practicals on a rotation system where every week a different person has a different experiment, it has just turned out that for me that we have learned about the single slit experiment before I have had the chance to do the double slit.
 
All this Manday, Mayday stuff is getting confusing :-p
 
Yes, that's yet the second time I find someone calling himself Mayday though and I've never found anyone named ManDay at all. (apart from that one inactive AAO player which has registered an account on the name ManDay in the year 2000 and has never played since, occupiying my name for no reason...)

But we're lucky that you have underscores and no capital D in your name, you we can be better told apart.
 

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