Natural Science Forum / Physics / Optics / May 2007

What is the difference, if any, between working distance and front focal
length?
I realize that the front focal length is only defined for thick lenses,
but essentially all real lenses are thick lenses.

I am designing a "game table". One aspect of this, is a polycarbonate
list, which I want to have special optic properties. Since I am
completely blank in this issue, I would like somebody to solve this
problem for me. (no cure, no pay based). Who takes the challence?

Dear Group,
Today I have a question regarding a mechanical-optical malfunction of
a microscope objective made by a major manufacturer.
The objective is a 40x, Plan Apo with correction collar.

Highspeed computing using fiberoptics:
Using the formula
  lambda = c / f
where c is the speed of light in m per sec (= 3E8 m)

I just recently purchased a 25mw multi-line argon laser and am using a
600 lines/mm diffraction grating to separate the beams.
Now excuse me for a possibly stupid question, but is there a more
efficient way of doing this? The 0'th order beam is  very bright telling

A Popular Handbook to the Microscope by Lewis Wright ,1895,slight
foxing to endpapers otherwise VGC,256 pages.
Lovely copy of this Victorian manual of microscopy.Packed with superb
illustrations.

I am the excited new owner of a Zeiss Ultraphot III with a near complete
set of luminar, epi-luminar, and epiplan-pol/DIC lenses.  The scope was
originally specified for metallurgical (i.e. reflected light) work.
I don't understand why there appears to be no color information to

I have what may seem to be a simple question.
I understand emission spectra. I also understand absorption
spectra. If you have an excited media, it will emit spectral
lines. Conversely, a media will absorb on those same spectral

I have been reading the comments in the sci.techniques.microscopy
group and I am impressed with the high level of knowledge that Kevin
has about microscopes. Hpe he read this.
I was given a used microscope  CORRECT TOKIO of SEIWA OPTICAL, in a

Which companies are working on the production of optical/photonic CPUs ?

Hi, I have been scavenging printers for stepper motors (a completely
different project) and happened across a laser diode + optics that
seems to be in pretty good condition.  I have been interested in
lasers for a while and thought I might as well try to get it running.

Ok Guys here goes. HELP !!!!!!
I have a 2111P-MLHCH_R power supply with no switch and a
DB -25 plug. The tube is a 2213-75TSLKT. I have no filament voltage
either from the PS or at the laser head. I also have 1 & 3, 2 & 13,

Ya got a 263C   PSU   163C-12   psu/head  pinouts?   I've got a fellow
on PL forums asking questions and all we have in the FAQ is the remote
connector pinouts.
exact models are

I'd like to teach myself a home optics lab course covering the same material
as a college optics lab course. That takes, among other things, equipment and
a syllabus. Any idea of how much that would cost and how to obtain it at that
price? One advantage of doing it on my own is that ...

Hello , I want to compare and simulate lenses with historic
importance. I have lensview program and kdp 2. I want to change the
reference image pixels with historic lens psf , for each color and
position.