Re: Color constancy

[Scott Goelzer <sgoelzer@COEBROWNACADEMY.COM>]

I see the haze with and without glasses - so do my students. If I had to
guess, looking at the orange directly overwhelms the very faint
perception of color. I wonder if all of us perceive  a UV source the
same.

Scott



> Date:    Thu, 2 Nov 2000 15:29:08 -0500
> From:    Robert A Cohen <bbq@ESU.EDU>
> Subject: Re: Color constancy
>
> Why is the purple haze *around* the orange instead of coincident with it?
>
> My first impression was that only those with glasses would be able to see
> the purple haze (due to dispersion through the glasses) but I had assumed
> the colors would be coincident.
>
> ----------------------------------------------------------
> | Robert Cohen               Department of Physics       |
> |                            East Stroudsburg University |
> | bbq@esu.edu                East Stroudsburg, PA  18301 |
> | http://www.esu.edu/~bbq/   (570) 422-3428              |
> ----------------------------------------------------------
>
> On Thu, 2 Nov 2000, S.Goelzer wrote:
>
> > Also, on the subject of color perception, when I show a one of the plasma
> flower
> > light bulbs* some students can see a faint purple haze around the orange
> plasma and
> > others cannot. I think this maybe the result of being able to perceive
> color deeper
> > into the UV. I can see it  clearly, and I find that other students with
> blue eyes
> > are more likely too as well.
> >
> > *( this device is a clear glass light bulb with two metal flowers inside
> almost
> > touching, one to each potential. When plugged in, an orange plasma coats
> each
> > flower. The petals, covered with green florescent paint, glow. A
> diffraction
> > grating revealed a spectrum matching mercury.)

--
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Scott Goelzer
Physics Teacher
Coe-Brown Northwood Academy
Northwood NH 03261
sgoelzer@coebrownacademy.com
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