Day 42: Ray Diagrams

Friday, 10 October 2014


In one class, it was time to formalize ray diagrams in spherical mirrors. The problem? It was Friday afternoon. Above, in an attempt to make a more accurate diagram, I’m showing off my poor man’s compass — a piece of string. What I learned is that the amount of mirror curvature I used to eyeball is way more than there actually is. Also, this process helped the kids understand the point C, center of curvature.

I learned an important lesson today: don’t show ray diagrams to freshmen last period on a Friday before a long weekend.


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