Suitable experiment for 16-year-olds? Topic: "Light" Does anyone have a suggestion for a good physics experiment for first-year high school students (in Denmark), which has to do with light? It doesn't matter what, it only needs to be "fleshy" enough to write a three-page report about, include a series of concrete measurements which can be used in calculations, and NOT include any trigonometry (since they haven't learned to use that yet). This last requirement sadly throws any spectral measurements and other grating/interference experiments. I would be very appreciative of any ideas you may have.