🚀 go-pugleaf

"Richard Dobson" <richarddobson@blueyonder.co.uk> wrote in message 
news:2BRCn.8464$Ac1.8005@newsfe20.ams2...
> On 01/05/2010 05:25, Pentcho Valev wrote:
>> According to Newton's emission theory of light, the SPEED of light
>> varies with the speed of the observer.
>>
>> According to Maxwell's theory, the SPEED of light varies with the
>> speed of the observer.
>>
>> According to Einstein's special relativity, the WAVELENGTH of light
>> varies with the speed of the observer.
>>
>> The assertion that the SPEED of light varies with the speed of the
>> observer is physically reasonable. The assertion that the WAVELENGTH
>> of light varies with the speed of the observer is absurd.
>>
>
>  Why? We see it ~all the time~ in daily life. We don't see the propagation 
> speed of a wave [net velocity of the medium being zero] changing with the 
> speed of the source, whether in air or water. It is physically 
> UNREASONABLE.
>
> Richard Dobson

Valev has exceeded his own mandate on this one.
    http://www.androcles01.pwp.blueyonder.co.uk/Wave/Relative.gif
As the gif shows, wavelength is observer dependent unless both crests
can be observed simultaneously, and that is impossible when light
is used to measure light. One cannot measure any length by looking
at one end of a ruler only, and that is what is being attempted, even
by a diffraction grating.