[ballaratdragons (Ken)]

Here ya go Tony: http://c2431622.cdn.cloudfiles.racks...refracting.gif

Here's the whole section on it: http://www.universetoday.com/15968/refractor-telescope/

or this one: http://findascope.com/glossary.html

This one shows the EP as well: http://calgary.rasc.ca/telescopes/index.htm