Double Slit Geometry

Implied, but not stated on the worksheet is the need to derive the geometry that leads to a cosine pattern on the screen behind a double-slit setup. Here's a 10-minute lecture describing this geometry. When he gets to the examples starting at the ~5:00 mark, you should pause the video and try to get the answer for yourself first, and then check against his answer.



Here are two nice demonstrations of diffraction, using water and laser light:



Finally, here's a Minecraft experiment showing the particle-wave nature of chickens