From: "Dwight K. Elvey" 
To: atm{at}shore.net
Reply-To: "Dwight K. Elvey" 


Hi
 Intersting observation. If there were a problem, we'd have
a hard time seeing anything. My understanding is that the waves only
interact when the medium becomes non-linear. Of course, as another
mentioned, there is a continuous interference that is right where the beams
cross. Since these waves have different directions of travel and there is
no non-lenear interaction, when the waves energies go out of the
interacting area, they continue as though the other wasn't there. I've seen
this demonstrated in a water wave tank at one time. If both were at the
same frequency, there were a lot of funny standing wave effect where they
crossed but out side the intersection, the waves went on there original
coarse.
 Air takes a really high energy level before non-lenearity
is much of an issue. These are tricks used in LASER work. There are solid
materials that have non-linear effects that are used for such things as
frequency doublers. Dwight


>From: "A. Suykerbuyk" 
>
>Hi,
>
>Everywhere in the universe light is coming from all directions, intersecting
>is normal.
>
>Regards,
>Adrie Suijkerbuijk.
>
>-----Oorspronkelijk bericht-----
>Van: Harold 
>Aan: ATM 
>Datum: zondag 19 januari 2003 21:30
>Onderwerp: ATM intersecting light
>
>
>>
>>
>>
>>  In a typical newt. telescope, the incoming  light hits the primary mirror
>>and is reflected back to the secondary and is then diverted to cross
>through
>>the incoming beam. This probably sounds rediculus, but i find it facinating
>>how this intersecting doesn't somehow interfere with the optical image.If
>>light is invisible then how can we see it. If it's not invisible then....
>>humm, perhaps someone with a better understanding of light and optical
>>properties could enlighten ( no pun intended) me.
>>
>>  Harold
>>
>>
>
>
>

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