Wednesday, 6 November 2013
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.
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.