> to Mr.Thomas Smid,

> As you write, in the medium, light propagates at the speed of c/n. In the air, it may be the same. But i ask, why it's not an explanation for M-M experiment ? For what reason ? (as to vacuum, the emission theory supports)

c/n is the light speed in the rest frame of the medium. In the rest frame of an observer moving with velocity v relatively to the medium, the velocity is c'=c/n+v*(1-1/n²) (see http://renshaw.teleinc.com/papers/fizeau/fizeau.stm ).
For the Michelson-Morley experiment both the light source and detector were at rest relatively to the medium (the air) i.e. v=0, so this explains the zero result. Of course, people at the time were thinking of a different medium, the ether, but this was just a hypothetical assumption (without any physical basis) because it was thought that any wave needs a carrier medium, and since light can also travel in a vacuum, it was assumed that such a medium must exist. But they obviously overlooked that according to Maxwell's equation light can travel without a carrier medium as it carries itself (to be more precise, the electric wave carries the magnetic wave and vice versa). So again, from this point of view the M-M experiment must result in a negative outcome as well .

Thomas

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> > to Mr.Thomas Smid, > > As you write, in the medium, light propagates at the speed of c/n. In the air, it may be the same. But i ask, why it's not an explanation for M-M experiment ? For what reason ? (as to vacuum, the emission theory supports) > c/n is the light speed in the rest frame of the medium. In the rest frame of an observer moving with velocity v relatively to the medium, the velocity is c'=c/n+v*(1-1/n²) (see <A HREF="http://renshaw.teleinc.com/papers/fizeau/fizeau.stm">http://renshaw.teleinc.com/papers/fizeau/fizeau.stm</a> ). > For the Michelson-Morley experiment both the light source and detector were at rest relatively to the medium (the air) i.e. v=0, so this explains the zero result. Of course, people at the time were thinking of a different medium, the ether, but this was just a hypothetical assumption (without any physical basis) because it was thought that any wave needs a carrier medium, and since light can also travel in a vacuum, it was assumed that such a medium must exist. But they obviously overlooked that according to Maxwell's equation light can travel without a carrier medium as it carries itself (to be more precise, the electric wave carries the magnetic wave and vice versa). So again, from this point of view the M-M experiment must result in a negative outcome as well . > Thomas

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