Name Last modified Size Parent Directory 2001-SEP-21 10:32:24 0 concavelens.jpg 2000-JUN-16 09:48:53 1201 convexlens.jpg 2000-JUN-16 09:48:57 1163 focaldiagram.jpg 2000-JUN-16 09:49:08 6k telescopes.html 2000-JUN-22 21:30:25 15k