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From: j4murali on 22 Feb 2010 03:48
Hi All

I have a newbie question. I would like to find out what is the lens
equation of the following optical setup. Specifically I would like to
find out what is the effective focal length of such a setup.

In a very simple periscope I have 2 mirrors tilted at 45 degrees. Now
instead of planar mirrors, i have two curved mirrors (concave mirrors)
with each focal length of -F. What is the effective focal length of
the combined system?
Assuming that the two mirrors are placed at a distance of 2F(between
two mirror centers).

Since the optical axis is tilted and shifted, I would like to also
hear some pointers as to what kind of aberrations become dominant?

Any comments/feedback is appreciated.

best regards
-mJ
From: Baron on 22 Feb 2010 20:57

"j4murali" <j4murali(a)gmail.com> wrote in message
news:9c57bda2-36c9-4cb7-9622-a81679e3fc68(a)g11g2000yqe.googlegroups.com...
> Hi All
>
> I have a newbie question. I would like to find out what is the lens
> equation of the following optical setup. Specifically I would like to
> find out what is the effective focal length of such a setup.
>
> In a very simple periscope I have 2 mirrors tilted at 45 degrees. Now
> instead of planar mirrors, i have two curved mirrors (concave mirrors)
> with each focal length of -F. What is the effective focal length of
> the combined system?
> Assuming that the two mirrors are placed at a distance of 2F(between
> two mirror centers).
>
> Since the optical axis is tilted and shifted, I would like to also
> hear some pointers as to what kind of aberrations become dominant?
>
> Any comments/feedback is appreciated.
>
> best regards
> -mJ

there are free SW programs on the internet that will solve this and other
optical problems


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