I told them how to go from the interesting straight line we got when graphing sine of one angle versus sine of the other angle when light enters a new medium. I then told them about the index of refraction and gave them some examples. Then we worked on some practice.
I have no photos today. Today was hectic. I got two new students, one in each section of my physics first class. I had no notice. That, on top of a lesson that really didn't work for those students because it was too complicated, really made today a hard today. Did I mention it was open house yesterday? I am so tired.