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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