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Puzzle of negative result of Michelson Morley experiment

  1. Aug 28, 2015 #1

    mdn

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    HI all
    How can Michelson itself predicted contraction of length and Einstein about constancy of light from negative result of MM experiment.
    forget about existence of ether, light speed always same in moving frame of reference and importantly in any direction so how can one except shift in fringes?
    not only light, any object would have been same speed in all direction in moving frame of reference.
     
  2. jcsd
  3. Aug 28, 2015 #2

    russ_watters

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    Staff: Mentor

    That last part is called The Principle of Relativity and extending the concept to include light while reconciling it with a constant speed of light was indeed the key conclusion. To most people that is a surprising result and to make like be the same speed for everyone regardless of their state of motion requires length contraction/time dilation. Otherwise, shooting a beam of light from a moving object to a stationary one would give two different speeds of light according to the two observers.
     
  4. Aug 28, 2015 #3

    mdn

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    thanks
    the answer would have been " no ether" that's sufficient. would you give me one practical example where Galilean transformation is ineffective?
     
  5. Aug 28, 2015 #4

    Nugatory

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    Staff: Mentor

    There is a sticky thread at the top of this forum on experimental confirmation of relativity. The great majority cannot be reconciled with the Galilean transforms.

    Fizeau's 1850 measurements of the speed of light in a moving medium are a direct falsification of Galilean transformations.
     
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