Magnifying Visors

Can you help me find a college physics experiment related to Electromagnetics OR basic optics?

It has to be SIMPLE and INTERESTING and can be done within two hours, plus the materials easily availed. It's for our peer review experiment for physics lab. Our professor wants us to measure design the experiment in such a way as to measure something quantitavely (e.g. current through a bulb or magnetic field). Please help me. I need three different experiments.

Public Comments

1. http://www.youtube.com/watch?v=a0YCTwWvykw When calculating an eddy current polarity is considered moot. Nothing in the formula addresses polarity. The comments below the video are not correct according to my perception. To me it is 11 on a scale of 10 interesting.