Two slit interference and diffraction

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Discussion Overview

The discussion centers around the choice of light color for two-slit interference and diffraction measurements, examining the implications of using red light compared to blue or white light. The scope includes theoretical considerations and practical applications in optics.

Discussion Character

  • Technical explanation, Conceptual clarification

Main Points Raised

  • Some participants suggest that using monochromatic light, such as from a laser, is preferable for interference measurements, ruling out white light.
  • One participant proposes that red light may enhance the visibility of the interference fringes.
  • Another participant notes the cost difference, indicating that red HeNe lasers are more affordable compared to blue lasers.
  • A participant mentions that red laser light has a larger wavelength than blue light, which could result in a greater separation of the interference fringes, potentially magnifying the observed effect.

Areas of Agreement / Disagreement

Participants generally agree on the advantages of using monochromatic light, particularly red light, but there are varying opinions on the reasons for this preference, including visibility, cost, and wavelength effects. The discussion remains unresolved regarding the optimal choice of light color.

Contextual Notes

Participants have not fully explored the implications of using different wavelengths on the interference patterns, and there may be additional factors influencing the choice of light that are not addressed.

nemzy
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why is it better to use red light , instead of blue or white light, for 2 slit interference and diffraction measurements?
 
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It's better for the radiation to be monochromatic (laser beam,if possible),so white light is outta the question.As for what color,maybe the fringes look better in red...?

Daniel.

P.S.Neon laser is pretty common in optics.That line is in the red part of spectrum.
 
Red HeNe lasers are very cheap. Blue lasers, on the other hand are very expensive.

Claude.
 
Red laser light also has a larger wavelength than blue light. Therefore creating a larger separation in the fringes, allowing for a magnifies effect.


Regards,

Nenad
 

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