Double slit interference with single pencil lead?

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Discussion Overview

The discussion revolves around the nature of interference patterns produced in a homemade double slit experiment using pencil lead. Participants explore whether the observed patterns from a single pencil lead can be classified as double slit interference or if they represent a different phenomenon.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant suggests that using a single pencil lead can produce an interference pattern similar to that of a double slit experiment.
  • Another participant argues that a single slit or obstruction would create a diffraction pattern, not an interference pattern, implying a distinction between the two phenomena.
  • A different participant notes that a single slit can produce interference as well, but it manifests on a larger scale, referencing external sources for clarification.
  • Links to external resources on diffraction and interference are shared by participants to support their claims.

Areas of Agreement / Disagreement

Participants express differing views on whether the pattern from a single pencil lead constitutes double slit interference or a diffraction pattern, indicating a lack of consensus on the classification of the observed phenomenon.

Contextual Notes

Participants reference external sources for definitions and explanations, which may introduce varying interpretations of interference and diffraction. The discussion does not resolve the distinctions or implications of these terms.

Kern
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Hi guys,

Was trying out a home made double slit experiment as I've seen on youtube with a laser pointer and 2 pieces of pencil lead. Then I realized that I can obtain the same interference pattern with the single pencil lead.

Is this equivalent to a double slit interference?
 
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A single slit or an obstruction would create a diffraction pattern, not an interference pattern.

Here's a great site to explain the differences...

http://www.lightandmatter.com/html_books/lm/ch32/ch32.html
 
Last edited by a moderator:
Single slit produces interference too but it has larger scale. You can read about it in wikipedia: Single-slit diffraction

Image from wikipedia:
Single_slit_and_double_slit2.jpg


Another image.
http://tsgphysics.mit.edu/pics/P%20Interference/Q2-P10-Laser-Diffraction-and-Interference-still.jpg
 
thanks for the links! will read them up :)
 

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