Day 42: Ray Diagrams

Friday, 10 October 2014

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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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