Re: ATM Optical Path Lengths For Star Diagonals

[astillma@nit.AirTouch.COM (Anthony Stillman)]

Fred,

I'm sure I don't need to tell you this so I state it for any beginners.  If the
 star diagonal uses a prism instead of a mirror you must multiply the 
physical path length through the glass by the index of refraction of the glass
to get the effective optical path length.  For most purposes n=1.5 is good
enough.

>  ___{W}___
> |    :    |
>  |   :   |
>  |   :   |{H}  __ {C}
>  |   :   |    /
> |    :    |__/
>  \-------    |_______
>   \  :    :  |       |
>    \ :    :  |       |
>     \-----:--|       |
>      \    :  |       |
>       \   :  |_______|
>        \    _|
>         \__|
       | {G}|

G - 1/2 physical path through glass


Anthony