Re: a link to some interesting illusions

[Larry Woolf <Larry.Woolf@GAT.COM>]

Re: http://www.iscc.org/pdf/demystifying_screen.pdf
Question and answer #1

I believe that the question is appropriate.

The question addresses the common misconception that "all of the colors are
in the rainbow."

This may not be a misconception among physics teachers, but it is among many
students. Magenta is easily used as an example of a color that consists of a
mixture of short and long wavelengths -  a non-spectral color.

The purpose of the site is to address common color misconceptions - as
such, it does a pretty good job.

At 3:22 PM -0700 2/3/2003, Tim Folkerts wrote:
> The web site asks - true or false - "Blue, cyan, yellow, green and magenta
> are seen in the rainbow."
>
> The answer is false, because magenta (blue+red) isn't seen.  The others -
> including green and yellow - are certainly seen but since it says "and"
> then by strict logic, the statement as a whole is indeed false.  I think
> the answer is poorly worded and misleading, but it is, strictly speaking,
> correct.


Larry Woolf,General Atomics,San Diego, CA 92121; Phone: 858-526-8575; FAX:
858-455-8568