Day 50: Critical Angles

Wednesday, 28 October 2015

What’s going on in the above images? (In class, we gathered around the dish of water) In the first case, the laser is being refracted to about 75° from the normal. And in the second, we have total internal reflection. There are also some stray bits of light mixed in there, too.

So I asked the kids to think about this idea, I named that angle where we flip from refracting light to reflecting light, and we learned about how to calculate critical angles.IMG_20151028_111543

We ended the discussion by connecting critical angles to the Olympic Pool image I showed last Friday.

Screen Shot 2015-10-27 at 4.16.30 PM

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