Cecil Moore wrote:

To Jim, and anyone else who wants to discuss it. I've created
a graphic illustrating reflections from a thin-film when the
incident laser beam is at an angle to the thin-film surface.

http://www.qsl.net/w5dxp/weblaser.GIF

Question for Jim: I can see Reflection A and Reflection B.
I can measure the irradiance of Reflection A and Reflection B.
Are the two reflections really there or not? If they are there,
do they possess energy and momentum?

That will get us started.

It doesn't show up on my web browser. Do you have the URL right?

If you have a photon zinging through space it posseses both energy and
momentum, and they are each an easy function of the wavelength.

To pick nits, if you have a _stream_ of photons zinging by it will
posess, on average, power and thrust (or whatever the time-derivative of
momentum is called). If reflections A and B are both there they will
each carry a certain amount of power and exert a certain thrust somewhere.

If you have actually set up this thin film experiment and measured two
seperate reflections then they are indeed there. You can debate whether
the reflections are truely reflective of the theory that you're trying
to demonstrate or if they reflect (or perhaps reflect off of?)
imperfections in your experimental setup.

--
-------------------------------------------
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Tim Wescott wrote:

Cecil Moore wrote:

To Jim, and anyone else who wants to discuss it. I've created
a graphic illustrating reflections from a thin-film when the
incident laser beam is at an angle to the thin-film surface.

http://www.qsl.net/w5dxp/weblaser.GIF

Question for Jim: I can see Reflection A and Reflection B.
I can measure the irradiance of Reflection A and Reflection B.
Are the two reflections really there or not? If they are there,
do they possess energy and momentum?

That will get us started.


It doesn't show up on my web browser. Do you have the URL right?

If you have a photon zinging through space it posseses both energy and
momentum, and they are each an easy function of the wavelength.

To pick nits, if you have a _stream_ of photons zinging by it will
posess, on average, power and thrust (or whatever the time-derivative of
momentum is called). If reflections A and B are both there they will
each carry a certain amount of power and exert a certain thrust somewhere.

If you have actually set up this thin film experiment and measured two
seperate reflections then they are indeed there. You can debate whether
the reflections are truely reflective of the theory that you're trying
to demonstrate or if they reflect (or perhaps reflect off of?)
imperfections in your experimental setup.


OK, now I can see your post. Yes, those reflections are real, and the
numbers are probably about as good as you'll get from clean AR coated
glass, IFAIK (_dirty_ AR coated glass will give you much larger
reflections). Laser rangefinders get one heck of a return when they
fire, and are limited in the minimum range that they can measure because
of the time that it takes for the receiver to recover (or be turned on,
depending on the LRF architecture).

I'm confused by your confusion -- what are you trying to do, and why do
you have to ask?

--
-------------------------------------------
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Tim Wescott wrote:
I'm confused by your confusion -- what are you trying to do, and why do
you have to ask?

I'm not confused. I'm trying to alleviate Jim's confusion. :-)
The next step is to slowly collimate the beam normal to
the thin-film and watch what happens to the reflections. Jim
implies there won't be an internal reflection from surface 'B'
when the beam is collimated. I say it will still be there
possessing energy and momentum. That's the crux of our argument.
--
73, Cecil http://www.qsl.net/w5dxp

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Tim Wescott wrote:

Cecil Moore wrote:
http://www.qsl.net/w5dxp/weblaser.GIF

It doesn't show up on my web browser. Do you have the URL right?

Dang, you guys are fast. You must have caught it just as I was
downloading the simpler version. Please try again.

If you have actually set up this thin film experiment and measured two
seperate reflections then they are indeed there.

I probably could set up that experiment but right now I'm just
talking about it. I'm sure the angle of incidence could be
adjusted until both reflections show up as separate dots on the
retina. How much laser power will burn a retina?

In any case, essentially the same diagram is in any good physics
book. Page 1350 in "Sears and Zemansky's University Physics" by
Young & Freedman, Texas A&M custom edition. Page 505 in "Elements
of Physics" 2nd edition, by Shortley and Williams (c) 1955 :-).
--
73, Cecil http://www.qsl.net/w5dxp

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On Fri, 10 Jun 2005 19:39:24 -0500, Cecil Moore
wrote:
Texas A&M custom edition.
This probably cuts to the root of the gross inaccuracies. The
material in this "costume edition" is not up to the necessary math
required for this failed presentation that has been offered.

The math itself is not especially difficult, and it is derivable; but
you have made no effort to even approach a correct solution.

Richard Clark wrote:
Cecil Moore wrote:
Texas A&M custom edition.

This probably cuts to the root of the gross inaccuracies.

The only difference in the Texas A&M custom edition of
"University Physics" and the other editions is the big
maroon 'T' on the cover. Hint: Bad-mouthing Texas A&M
is probably a negative return on investment for you.
There's a good chance that one of your superior officers
in the military graduated from Texas A&M.

General Patton once remarked something to the effect:
Give me a bunch of West Point officers and I will win
a battle. Give me a few Texas A&M officers and I will
win the war (actual quote although not verbatim).
--
73, Cecil http://www.qsl.net/w5dxp


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On Tue, 14 Jun 2005 17:57:16 -0500, Cecil Moore
wrote:
(actual quote although not verbatim).
then it is not a quote, is it?

You would do far better exemplifying than simply offering 2 degrees of
separation from someone famous (it could have been Madonna).

Anyway, no one really expects you to fix your errors. But we do
expect better Xeroxing from Bartlett's Quotations for lame excuses.

Richard Clark wrote:
"---(it could have been Madonna)."

There was a famed A&M coed said to be sweet to all the faculty but
rotten to the corps.

Best regards, Richard Harrison, KB5WZI

Cecil Moore wrote:
"Texas A&M custom edition".

My college text was by Shortley & Williams too, but it had no maroon T
on the cover.

There`s a story about a fellow telling a store clerk that he wanted a
complete outfit of clothes, head to toe, all in maroon. The clerk
responded:"So you`re an Aggie?" Fellow replies:"Guess it`s obvious
because I want all these maroon clothes?" Clerk says: "No, it`s obvious
because this is a hardware store!"

ONLY KIDDING.

Best regards, Richard Harrison, KB5WZI

Aggie and a West point grad are dining together. The Aggie opines that his
table mate must have attended West Point. "Why, yes I did, how did you
know?" .

The Aggie replied "Your impeccable table manners, your manner of dress, and
refinement of speech".

The West point grad then states "I see your an Aggie".

The Aggie puffs up with pride and expecting like accolades asks "How did you
know?"

"I saw your ring while you were picking your nose during dessert"

"Richard Harrison" wrote in message
...
Cecil Moore wrote:
"Texas A&M custom edition".

My college text was by Shortley & Williams too, but it had no maroon T
on the cover.

There`s a story about a fellow telling a store clerk that he wanted a
complete outfit of clothes, head to toe, all in maroon. The clerk
responded:"So you`re an Aggie?" Fellow replies:"Guess it`s obvious
because I want all these maroon clothes?" Clerk says: "No, it`s obvious
because this is a hardware store!"

ONLY KIDDING.

Best regards, Richard Harrison, KB5WZI