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Message from discussion Light Unpolarizer
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Fleetie  
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 More options Nov 9 2012, 6:33 pm
Newsgroups: sci.electronics.repair
From: Fleetie <flee...@fleetie.demon.co.uk>
Date: Fri, 09 Nov 2012 23:33:30 +0000
Local: Fri, Nov 9 2012 6:33 pm
Subject: Re: Light Unpolarizer
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Robert Macy wrote:
> Is it possible to see the polarized effect with the naked eye? On
> these types of glasses, I see the stresses at the corners where
> plastic is mounted as rainbow hues, very disturbing - interpret as
> cheapness.

The human eye can "sort of" detect polarisation of light.

http://en.wikipedia.org/wiki/Haidinger%27s_brush

I can see it; it's easy with practice.

1) Clear blue sky near sunrise or sunset : Look vertically up
   and spin yourself around by moving your feet. You will look
   a tit, but it's the best way to see it easily.

2) LCD monitor. Large clear area of white background. Again, rotate
   your head, so your head is vertical (normal position), then
   horizontal, etc..

In both cases, you are looking for a yellow-ish "bow tie" shape, at
the VERY CENTRE of your vision. The bits that aren't yellow, which bits
also form a bow-tie shape, appear (very) slightly blue-ish. Personally,
I find that the yellow is far easier to see than the blue.

Martin


 
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