Visit http://ilectureonline.com for more math and science lectures!

In this video I will finish deriving (part 2 of 2) the equivalent focal length of 3 lenses, 1-convex, 1-concave, and 1-convex, respectively, touch each other.

Next video in this series can be seen at:
https://youtu.be/N4P79X4pEq8