From: mathma18@gmail.com
On Wednesday, May 22, 2013 1:42:42 AM UTC+5:30, J-C wrote:
> "Narasimham Gudipaty" wrote in message
>
> news:.... @a15g2000pbu.googlegroups.com...
>
> On May 21, 2:17 am, "J-C" wrote:
>
> > wrote in message
>
> ----
>
> > As to Descartes ovals they are pretty useless in practice for a number of
>
> > reasons, while they may be stigmatic they do not fulfill the sine
>
> > condition
>
>
>
> > for example, therefore they can't be used for imaging extended objects.
>
>
>
> Thanks.(Working in India I have only a limited or ready access to such
>
> good old book sources. Apart from internet, trying to derive it
>
> afresh).
>
>
>
> But under what situations is Snell's law not valid ? Why cartesian
>
> ovals, with optical length invariance considered,do not obey the law?
>
> What situation makes it to re-conform ? ( I mean, when did the law
>
> become illegal :) ?).
> Narasimham
> ===============================================
>
>
>
> The references I gave you are entirely free and I am sure that you can
>
> download them in India as in most elsewhere.
> There are many more such "Google Books" texts in optics which are
>
> available for free at various levels and even if old they provide a good
>
> start at least for elementary (and in fact not so elementary) start in
>
> optics, geometrical and physical.
>
>
>
> You don't have to re-invent, re-discover or re-derive anything.
>
> And Google Books is only one of many such internet resources,
>
> many quite recent and up to date.
> Please choose two or three books and start to study them earnestly.
> We are very fortunate to have the internet at our disposal, Srinivasa
>
> Ramanujan had very few books but he did study whatever he had very
>
> hard.
>
> I am sorry but since I do not understand your question I am unable
>
> to give you an answer, now or later.
Thanks a lot for guidance and encouragement. Sorry for insufficent expression.
My aim was to see how to design a transmitter/receicer optical combo, source
inside denser medium between two foci, modifying Snell's law to suit
differetial equation
formulation.
http://i44.tinypic.com/2wgtymx.jpg
http://i40.tinypic.com/cuqzq.png
I have come this far, Snell's law not being obeyed was in fact a matter of
concern, but now ok.Optical path length tallies. Pl comment.
Regards
Narasimham
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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