Day 58: Wrapping Up Refraction

Wednesday, 6 November 2013

2013-11-08 12.44.33

The hazards of working with oil in a room of awkward 14-15 year olds.

Today was an F day, on which I have a light schedule — teaching just 2 of the 4 classes this day. Both classes were finishing up their Refraction Lab. I got some interesting responses from kids on my final two questions on the lab:

Why does no refraction occur when the angle of incidence is 0°?

Of my 58 students, I only saw one set of lab partners think to prove this using Snell’s Law. Their proof is below.

2013-11-08 12.45.04

Why, when the laser beam strikes the curved surface is the angle of incidence also 0°?

  • “Because the laser beam angle (incident angle) is 0.”
  • “The normal line is equivalent to the incident angle.”

Also, I gave out and explained the pinhole Physics of Photography projects this week.


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