In this activity, students will investigate various aspects of the behavior of light. First, they will use diffraction gratings to view the colors or spectrum produced by visible light, then hold the diffraction grating in front of different light sources and record the colors that they see. They will examine common materials to determine whether they are transparent, translucent, or opaque and use a compact disk as a diffraction grating to look at different types of lights. They will also investigate the additive properties of color using spinning disks, investigate mirages with the help of a penny in a glass of water, and explore the connection between light and heat energy.