Re: how do you make WHITE?

[Ludwik Kowalski <KowalskiL@MAIL.MONTCLAIR.EDU>]

It was my understanding that to "reconstructs the incoming wave perfectly"

includes a possibility of seeing through a layer of quartz particles as if
it were
air, vacuum or glass. This is not the same thing as "measuring particle
contamination".

If the diameter of one sphere is 10 micrometers (20 lambdas) then a layer
1 m by 1 m, and only 1 cm thick, will contain (order of magnitude) 10^11
spheres. Is this big enough for a "zillion"? My prediction is that the
layer
(a perfect crystal-like structure) will be translucent but not
transparent.

brian whatcott wrote:

> I DO recall that one method adopted for measuring particle
> contamination in liquids was to measure the forward scattering
> of a laser beam in e.g wine. More or bigger particles led to more
> scattering, I seem to recall.