An Abbe diagram plots the Abbe number against refractive index for a range of different glasses (red dots). Glasses are classified using a letter-number code to reflect their composition and position on the diagram. Data plotted from the Schott Glass catalogue.
<ul><li><a href="//commons.wikimedia.org/wiki/File:Abbe-diagram.png" title="File:Abbe-diagram.png">Abbe-diagram.png</a>: <a href="https://en.wikipedia.org/wiki/User:DrBob" class="extiw" title="en:User:DrBob">Bob Mellish</a></li>
<li>derivative work: <a href="//commons.wikimedia.org/wiki/User:Eric_Bajart" title="User:Eric Bajart">Eric Bajart</a></li></ul>
CC BY-SA 3.0
<a href="//commons.wikimedia.org/wiki/File:Abbe-diagram_2.svg" title="File:Abbe-diagram 2.svg">Abbe-diagram 2.svg</a>