On 7/20/2011 4:22, Warp wrote:
> light passes between two objects which are very close to each other, so that
> the objects affect the light even though it's not technically speaking
> "touching" them,

It is called "diffraction".  More than you ever wanted to know at wikipedia.

Note that just rolling up your index finger and peeking thru the hole, or 
putting two fingers next to each other and looking at the slit between your 
fingers when your knuckles are touching, is small enough to give you visible 
diffraction effects. Say, half a mm?

-- 
Darren New, San Diego CA, USA (PST)
   "Coding without comments is like
    driving without turn signals."

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