Ritter Discovers Ultraviolet

In this activity, students perform a version of the experiment of 1801, in which ultraviolet light was first discovered by Johann Wilhelm Ritter. This experiment should be conducted outdoors on a sunny day - variable cloud conditions, such as patchy... (View More) cumulus clouds or heavy haze will diminish your results. This activity requires advance preparation and special materials (e.g., glass prism, blueprint paper, household ammonia). (View Less)