Alberto Mendoza <jac### [at] usbve> wrote:
: Having no mass, photons always travel at speed of light, even when they
: go through transparent objects. They are absorbed and emitted several
: times before they escape the material.

  I can grasp this. However, what I still don't understand is the refraction
phenomenon.

-- 
#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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