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Mailinglist:PanoTools
Sender:John Houghton
Date/Time:2004-Nov-11 15:46:35
Subject:Re: entrance pupil - nodal point

Thread:


PanoTools: Re: entrance pupil - nodal point John Houghton 2004-Nov-11 15:46:35

--- In #removed#, "Erik Krause" <#removed#> 
wrote:

> What is the exact definition of nodal point? I assumed it identical 
> to the entrance pupil...

My Higher Physics text book says: "In any thick lens or system of 
lenses there are two points, called nodal points, such that a ray 
incident toward one nodal point will emerge as from the other nodal 
point in a direction parallel to the original direction".

In diagramatic terms: 
http://homepage.ntlworld.com/j.houghton/nodal_pt.gif

John





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