Why can't I see fringes with eyepiece in my Michelson Interferometer?

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SUMMARY

The forum discussion centers on the visibility of fringes in a Michelson Interferometer when using a spectrometer telescope with a 178mm focal length objective lens and a 15X eyepiece. The user can see localized fringes without the eyepiece but not with it. The response clarifies that the output beam is collimated, allowing visibility at infinity, while the eyepiece requires a screen at the focal plane to observe the fringes. This indicates that the configuration of the telescope is not the issue, but rather the need for proper placement of a screen.

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  • Understanding of Michelson Interferometer principles
  • Knowledge of optical components, specifically eyepieces and objective lenses
  • Familiarity with collimated light and focal planes
  • Basic experience with spectrometer telescopes
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Optical physicists, experimental physicists, and students working with interferometry and optical instruments will benefit from this discussion.

itsnaresh
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Hello Forum
I have constructing a Michelson Interferometer using sodium light. For viewing the fringes, I have used spectrometer telescope with objective lens of 178mm focal length, 35mm dia and eyepiece 15X. I can see the localized fringes when I view through the objective glass but without eyepiece but I do not see any fringe when I put the eyepiece. I wonder what could be the reason. Is it that the telescope is not of good configuration.

I would be grateful for your help.
 
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Hi,
I suppose that the output beam is collimated, so the image is at infinite and you can see it. But with the eyepiece, the image is formed at the focal plane, so you just have to put a screen behind the eyepiece.
 
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Hi

Thanks for your reply. I will try and let you know.
 

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