your choice. This image is a derivative work of the following images: File:Lens6b-en.svg licensed with Cc-by-sa-3.0-migrated-with-disclaimers, GFDL-en, GFDL-self-en...
| User | Bytes | Dimensions | Comment 2006-03-06 00:54:23 | DrBob | 25982 | 415×250 | SVG version of [[:image:lens6b.png]] English Achromatic doublet...
