okay now I have calculated the focal length using the actual formula which you
have mentioned... Now how can i place the lens in the exact length (focal length
say f=216) to get sharp and better image.

Sorry for asking all the basic doubts.. This is my first assignment in pov
ray...so i'm not fully aware of these things...

Le_Forgeron <jgr### [at] freefr> wrote:
> Le 24/10/2011 15:23, Arun Kumar nous fit lire :
> > Thanks for the clarification.
> >
> > But in this case 'd' is small when compared to R1 and R2, so can I use this
> > formula
> >
> > 1/f = (n-1) {1/R1 - 1/R2} ???
> >
>
> No, because 1/R1 = 1/R2 in your case... hence 0 if you truncate the
> formula, and d/nR1R2 become the important part.

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