Invisible nous apporta ses lumieres en ce 2007/11/09 10:21:
> Gail Shaw wrote:
>> "Invisible" <voi### [at] devnull> wrote in message
>> news:47342cbb$1@news.povray.org...
>>> For light, the velocity varies a little, but it's roughly 300,000 km/s.
>>
>> Ur, no. The speed of light in a vacuum doesn't vary at all. It's a 
>> universal
>> constant.
>>
>> 299 792 458 m.s^-1
> 
> Yes, the speed of light *in a vacuum* doesn't vary.
> 
> The speed of light in other mediums varies though. ;-)
Yes. the formula is simply: c = C / ior. "c" been the speed in that medium.

-- 
Alain
-------------------------------------------------
Wars are not paid for in wartime, the bill comes later.
Benjamin Franklin

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