Re: Building 30" Drum Scope

On May 31, 12:22 am, Chris L Peterson <c...@xxxxxxxxxxxxxxxxxx> wrote:
On Sat, 30 May 2009 09:05:57 -0700 (PDT), Hayden

<haydenflem...@xxxxxxxxx> wrote:
Are you imagining some simple case, like two monochromatic point sources
at infinity, separated by some angle? That would produce two incident
plane waves at different angles with respect to the optical axis.
Yes exactly as you described above. because if the diffraction
patterns created from slanted plane wave is at an angle too.

Well, then you get a more complex interference pattern, that's all. It
isn't an image of the two point sources, though. And in this case, it is
not clear what "resolution" means. The diameter of the Airy disc and its
rings, and the energy distribution within them, is determined by the
nature of the aperture. If you have a pair of sources, you can calculate
what the resulting interference pattern will look like, but there's no
"resolution" involved.
_________________________________________________

Chris L Peterson
Cloudbait Observatoryhttp://www.cloudbait.com

Have you seen any figure with two plane waves, one at
an angle and the resulting complex interterference
pattern produced at the screen without any objective.
I haven't seen this in 4 optic books and over 20 web
sites. I'd like to know the relationship between those
two point source at infinity. In a telescope with lens
or mirror, the two point sources have corresponding
blur points by diffraction and Rayleigh limit is when the
diffraction discs is half the radius of the disc apart. I'd like
to know the corresponding pattern produced in an
aperture without lens/mirror or hole to see why
and how it differs to the aperture with objective.
Have you seen such figure or can create one
youself?

You are saying that even with 2 or more point
sources that produce plane waves at an angle,
the resulting airy pattern would be singular only??
Meaning 2 or more input points would produce
only one fat airy disc unlike in a telescope with
objective where the 2 input points would have their
corresponding blur points or airy disc??

Is the above what you mean? Any illustration of 2 or
more plane waves at an angle in any book
could illustrate the concept well but yet none
of them have this key figure.

Hay
.

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