11 more days....
 

"Short Wave Sportfishing" wrote in message
...

On Wed, 01 Nov 2006 23:04:19 -0500, Wayne.B
wrote:

On Thu, 02 Nov 2006 00:26:52 GMT, Short Wave Sportfishing
wrote:

It's not that complicated - light is particles, has mass and as a
result can be affected by gravity.

Speaking of which, perhaps you could explain to us how to derive the
absolute speed of light from Maxwell's wave equations. I find it
fascinating that the math to do that was in place so far in front of
Einstein's work and all of quantum physics.

Maxwell's experiments and combinations of the theories of Farady, Gaus
and Ampere indicated that EMF traveled fairly close to the speed of
light in a vacuum which led to the conclusion that light (actually
most forms of energy) was/is/can be a wave form and subject to general
EMF waveform laws.

I'm not a historical physicist, but I believe even Newton had some
ideas about the nature of light and posited that light was a particle
of some sort. And now that I think about it, wasn't it Fresnel's
experiments that proved that light held the form of a transverse wave?



If it wasn't then optical interference coatings wouldn't work and I would
have been out of a job.

Eisboch

11 more days....
 

"Short Wave Sportfishing" wrote in message
...

On Thu, 2 Nov 2006 06:59:46 -0500, "Eisboch" wrote:


If it wasn't then optical interference coatings wouldn't work and I would
have been out of a job.

LOL!!!

Yep.

Speaking of optical coatings, where these for eye glasses or
industrial applications?

I have some questions... :)


Most of the systems the company builds are for industrial or military
applications, usually involving lasers.
We have built several systems for ophthalmic coatings (anti-reflection on
eyeglasses) which are a lot more difficult to do than many people realize.
The green tint on coating eyeglasses is the result of a very carefully
controlled multi-layer deposition and although totally non-functional, it
has to be consistently uniform. It's only purpose is to convince the end
user that he got something for the extra money he paid. A good
anti-reflection coating has no color or tint to it. I have an eight inch
glass disk that was masked in all but the center, 2-inch diameter and then
coated with a good, multi-layer anti-reflection film. When you hold it, it
looks like a glass disk with a hole in the middle.

What are your questions? If I can't answer them, I can get the answers from
one of the thin film engineers
at:

http://www.vptec.com

I visit almost daily.

Eisboch

11 more days....
 

Short Wave Sportfishing wrote:
On Wed, 01 Nov 2006 18:23:15 GMT, "Stanley Barthfarkle"
wrote:


On 11/1/2006 10:24 AM, Clams Canino wrote:
And Harry's feral clock postings leave the bottom of the list. :)

You mean, it isn't February 31, 2007?

You know, in a sense, it could be.

Then why and how does the human body, wine, cheese, and even the dog
that got run over on the highway *age*?

The theory at hand states that we are "in" the realm of space and time,
(created by the 'big bang') but that the underlying principles of
'everything that is' are not bound by space/time, since space/time is a
byproduct. In other words, at the sub sub-atomic level of quantum mechanics,
there is no space or time as we know it. Space/time are not governing
features, but rather are governed.

...the mind boggles...

Interesting aspect of the "product" look at space/time is the whole
possibility of traveling forward in time.

In fact, in the past couple of years I believe, some researchers
produced a particle trace that appeared nanoseconds before it left the
accelerator.

Yes, they did.

11 more days....
 

"Short Wave Sportfishing" wrote in message
...


Nothing serious - I was just curious about anti-glare coatings vs
polarizing lenses and if there is actually a difference between the
two.

Oh, and the other thing - I was told once that you can't combine an
anti-glare and anti-scratch coatings on lenses. That true?


Don't take this for gospel, but I don't know of any "anti-glare" coatings
for glasses that reduce the glare of a viewed object, other than density
filters like sunglasses. "Anti-reflection" coatings significantly reduce
the amount of reflected light from the wearer's glasses themselves and
according to people who wear glasses it eliminates the reflected light
coming from behind the wearer, as well as the vanity factor.

Polarizing lenses are used to reduce glare from a viewed object.

As to scratch resistance, a hard coating on a plastic lens isn't thick
enough to protect scratches in the plastic.
You really can't make a soft substrate harder by the application of a hard
thin film. What is used is a coating called a "hydrophobic" coating that is
really a thin, long lasting lubricant. It helps avoid scratches on plastic
lenses by causing objects or other surfaces to slide across the surface of
the lens, rather than digging in and scratching. Often, the lens supplier
will provide a small bottle of conditioner to re-coat the surface from time
to time. Hydrophobic coatings are often combined with anti-reflection
coatings on eyeglasses and the index of refraction of the material must be
considered, otherwise it will render the anti-reflection qualities useless.

Glass and other hard substrates and lenses are different. There are
coatings such as diamond like hard carbon that are incredibly hard and
durable. They are used on expensive, usually military optics that are
subject to harsh environments or applications.

Eisboch

11 more days....
 

Short Wave Sportfishing wrote:
On Thu, 2 Nov 2006 09:13:26 -0500, "Eisboch" wrote:


Glass and other hard substrates and lenses are different. There are
coatings such as diamond like hard carbon that are incredibly hard and
durable. They are used on expensive, usually military optics that are
subject to harsh environments or applications.


Can I get some of that in a progressive glasses lens? :)

I hate plastic lenses if only because they scratch all the time -
PITA. I just returned from the glasses place and I was informed that
glass lenses are becoming a thing of the past.

Which sucks.


I finally changed over to the plastic progressive lens about 5 years
ago. My optical store gives 2 year guarantee on scratches.
My current glasses are now 3 years old and in great shape... no
scratches evident.
On my previous pair, the only scratch/scuff came when we ran aground on
a rock and I was thrown face first into the end of the boom.
Sure was glad my lenses were shatter resistant.