The second experiment we performed was all about light intensity. To cut the story short, it was a quick experiment, not taking up more than 30 minutes. It was a relatively easy task--- we simply measured the light intensity from a light source and a laser at different distances from the light source using a light sensor connected to labquest.
From the graph of light intensity vs. distance from light source, we observed an inverse square law; that is, the light intensity is inversely proportional to the square of the distance from the light source. This conclusion was obtained using data from the light source (not laser). The data we got from the laser showed that light intensity was constant even at great distances. It could probably be the case that the intensity from the laser was so high that very great distances would be called for to see the inverse square law.
We encountered minimal error, if none. I think our group had good dynamics because we finished the experiment in record time. I hope that the next experiments are going to be as easy as this, so that we would always finish ahead of time. :D