🚀 go-pugleaf

In article <1992Aug7.165808.1391@visus.com> jml@visus.com (Jim Large) writes:
>I've seen the same answer in my mail, and also:
>  "A shadow"	-- Kind of the same thing, although I don't know off 
>		   hand how many of us have USED a shadow.


Ever worn a baseball cap, etc.? Had an X-ray at the dentist? Used a liquid
crystal display? Opened a door with a photocell? Used a reticle or crosshairs
in a telescope?

(Putting his pseudo-philosopher hat on again...)

Is there a difference between a shadow and a diffraction or interference
pattern? For example is a holograph a shadow? It is pretty well known that
there is a bright spot in the center of the shadow cast by a disk. Is this
part of the shadow?

Later,
Andrew Mullhaupt