We started our second day with an introduction to our 2-week-long project, the ethics essay. After spending an hour or so deciding and narrowing down our topic choices for our ethics essay, we eventually decided to write about the topic of LEDs (12-6 win over the topic lasers). Then, we learned about spectroscopy from one of our teaching assistants in Dr. Peter's lab, including the photoelectric effect, spectrometers, emission spectrums, and absorption spectrums. 

In the morning Dr. Tu lectured us about diffraction, polarization, lasers, and also talked about some different light-based technologies. We then went on a tour of a bioengineering lab that focused on medical imaging. In the afternoon, we finished up yesterday's lab part B where we calculated the distance between grooves on a CD using Snell's law. Finally, we made some simple spectrometers using cardboard and deconstructed CD's. Using these, our groups had to find out what gases were used to illuminate gas lamps. The hardest part was differentiating between the emission spectrum for neon and nitrogen.