Formulas and reasoning behind finding focal length

[Apoxyus]

hey can someone give me the formulas and resoning behind finding focal length, magnitude of radius curvature, and other optic stuff. Thank you.

 

[Chi Meson]

You are looking for the "lens makers' equation." Here's one site: http://micro.magnet.fsu.edu/primer/java/components/characteristicrays/

you could do a search for this equztion to find dozens of other sites, but this one has a java applet tutorial. Might be good, I didn't go through it.

 

[Apoxyus]

Thanks