Understanding Converging and Diverging Rocket Nozzles

This video provides some interesting information on the rocket nozzle.

I always thought the view of mach diamonds during a rocket motors performance as a good thing.

https://www.nasa.gov/sites/default/files/atoms/files/sl_video_instruction_book.pdf

http://www.physicsclassroom.com/class/newtlaws/Lesson-3/Newton-s-Second-Law