strange blue laser optics

[Rick C]

On Friday, March 13, 2020 at 7:45:03 PM UTC-4, Mike Coon wrote:

In article <6da824f7-87cf-4ede-bfd0-fb71812c5801@googlegroups.com>,
gnuarm.deletethisbit@gmail.com says...

On Friday, March 13, 2020 at 3:23:16 PM UTC-4, Mike Coon wrote:
In article <8c62ca85-cb3a-4023-b98e-6a12606506ae@googlegroups.com>,
gnuarm.deletethisbit@gmail.com says...

I meant what I said. You seem to understand how the eye works. What
part of my statement was unclear?

For instance, how would an eye detect a "pure colour"?

The eye would easily detect the color of a pure color. The eye can be fooled by mixing pure colors. But give it a single wavelength like you get from an LED and it recognizes the color very well.

Heck, the eye can be fooled by multiple frequencies to the point of seeing colors that have no frequency in nature. Stimulate the blue and red receptors with minimal stimulation of the green and you see red-violet which has no corresponding wavelength. But it shows up on the color wheel.

Exactly; it's just that I distinguish between "detect" and "is fooled"!
I believe my TV generates no yellow light, but yet fools me into seeing
yellow in its pictures, "pure" or otherwise...

Yes, and when it comes to pure colors, the eye can easily detect small differences in color.

--

Rick C.

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[Michael Terrell]

On Friday, March 13, 2020 at 7:45:03 PM UTC-4, Mike Coon wrote:

Exactly; it's just that I distinguish between "detect" and "is fooled"!
I believe my TV generates no yellow light, but yet fools me into seeing
yellow in its pictures, "pure" or otherwise...

Sharp announced ten years ago that they were introducing yellow LEDs into thir TV product line. I remember (George Takei) the Star Trek Character Mr. Sulu in the commercials.

<https://www.tested.com/tech/tvs/1004-rgb-vs-rgby-does-adding-yellow-really-improve-tv-image-quality/>

 

[Dave Platt]

In article <4f5e536c-40e3-4123-b528-41d9ec046b58@googlegroups.com>,
Rick C <gnuarm.deletethisbit@gmail.com> wrote:

On Friday, March 13, 2020 at 4:34:32 PM UTC-4, Dave Platt wrote:

Your replacement lens is UV-transparent.

Are you confusing cornea and lens???

Conflating, at the very least :-(