Date: Mon, 7 Feb 2011 02:02:05 -

Author: ---

Subject: Re: my projector screen destroys circular polarization

Post:

On Sun, 6 Feb 2011, Paul Nord wrote:

> When you hold an object (buckeyball model) in the path, you get a pair
> of shadows cast on the far wall. If you wear REAL-D glasses each eye
> only sees one of the shadows. And you will see a 3-D image from the
> shadows.

Back in the old days, if you wanted to do a 3D stereo slideshow with two
projectors and polarizers, either you had to buy an expensive
polarization-preserving metallized screen, or you could use brushed sheet
metal or the matte side of aluminum foil. I think "rear projection" type
screens also might have worked too.

I suspect that the problem comes from multiple scatterings. Wouldn't
incoming light remain polarized if it was reflected from just one surface,
rather than bouncing around inside transparent particles inside "white"
paint?


(((((((((((((((((( ( ( ( ( (O) ) ) ) ) )))))))))))))))))))
William J. Beaty http://staff.washington.edu/wbeaty/
beaty, chem washington edu Research Engineer
billb, amasci com UW Chem Dept, Bagley Hall RM74
206-543-6195 Box 351700, Seattle, WA 98195-1700

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