To: Harold 
From: jmax{at}toad.net
Cc: ATM 
Reply-To: jmax{at}toad.net



Quoting Harold :

>   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
>
Light doesn't interact with itself, so the intersecting beams don't bother
each other. Light *does* interact with matter, so mirrors can reflect it,
and our eyes (and other sensors such as CCDs and photographic film) can
detect it.

-John


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