Jamie Davison <jam### [at] ntlworldcom> wrote:
: Not really.  Why do you think that c is usually expressed as the speed of 
: light in a vacuum.  The whole reason refraction works is due to changes 
: in the speed of light in various materials.

  c is the speed of light in vacuum. Period. It's constant. There are no
different c's for different media.

: c is *always* the fastest that anything can travel ina given medium

  Nope, c is the speed of light in vacuum. Nothing else.

-- 
#macro N(D,I)#if(I<6)cylinder{M()#local D[I]=div(D[I],104);M().5,2pigment{
rgb M()}}N(D,(D[I]>99?I:I+1))#end#end#macro M()<mod(D[I],13)-6,mod(div(D[I
],13),8)-3,10>#end blob{N(array[6]{11117333955,
7382340,3358,3900569407,970,4254934330},0)}//                     - Warp -

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