Why we rotate Michelson Morley Interferometer Apparatus by 90 degree

Last updated on Saturday, January 7th, 2023

Michelson Morley Interferometer

With the help of Michelson Morley Interferometer simulation, I have tried to explain these basic concepts…
Rotation of Interferometer
Michelson Morley experiment
Semisilvered glass plate role
the distance of two mirrors from the semi-silvered glass plate and its effect
time difference between two rays


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path difference between two rays and an Interference pattern
circular fringes
aether medium
ether medium properties
change in speed of light
change in the fringe shift is due to change in path
path difference opposite at 90 degrees from the initial case.


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Hiroji kurihara
Hiroji kurihara
4 years ago

About MM experiment

In a moving passenger car, MM experiment is being done. On the ground, an observer stands. To this observer, are constancy of light speed and Lorentz contraction compatible ? And also, constancy of light speed and time dilation compatible ?

hiroji kurihara
hiroji kurihara
5 years ago

MM experiment (done in air)

I found a word “extinction” in a book Special Relativity by French, A.P. 1968. It’s written as follows (original text ; quoted from “Google book” ; in 5-2). “Thus, for example, with visible light, a thickness of about 10-5cm of glass or 0.1mm of air at atmospheric pressure is almost enough to erase any possible memory, as it were, of the motion of the original source” (10-5cm is 0.0001mm). What ?? If it is so (from frequency or from wavelength, “memory” is not erased), the result of MM experiment is only natural.

Also, I found a book Theory of Relativity by Pauli, W 1958. In it, it is written as follows (quoted from the English version; in 1-6). “Rather should one say that ifor an observer moving with medium, light is propagated as usual with velocity c/n in all directions”. Extinction will ensure it. Also it seems to be the “very and true explanation” for MM experiment !!

Then, how about the experiment done in vacuum ? The emission theory seems to be promising.

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