Here is assignment 4 from my introductory photography unit. Assignment 4 explains and has an assignment on rule of thirds. Use the rubric included with assignment 1 to assess student work.
The handouts in this unit were used in my online photography class, and include all of the instructions and information that a student needs in order to learn photography. I've included screen captures, photos of the equipment, and exemplars in every handout. These lessons can be used by a teacher to teach photography, or can be given to the students as is for independent learning.