Re: [Phys-l] Feynman's messenger lectures now available

[Bernard Cleyet <bernardcleyet@redshift.com>]

I thought most (haven't met one that didn't) texts discuss ray tracing.  Is it too much of a leap from the previous to have a good idea what happens?   (The texts, I believe, also discuss the non-lin. eye's response.)


bc discovered his not so nonlinear


p.s.  I covered the top half of a projection lens (Kodak diapositive projector) and the field did not darken uniformly, but one would expect uniformity only in the position where one places  a stop.  The final lens was set back in the barrel, also.  I tried another lens w/ the last lens at the mouth of the barrel; rather good uniformity.  Finally covering half the lens (two stops; 1/4 transmission) produced much darkening!    One quarter was much less, but noticeable.


On 2010, May 19, , at 15:14, Anthony Lapinski wrote:

>  For example, I
> asked a student in my physics colleague's class, "If you cover the top
> half of a lens, how will the image change?" He struggled with this and
> said that his teacher never discussed this in class. To me, it's a
> fundamental idea of optics.*