Book excerpt: The activities in this book reinforce basic concepts in the study of light and sound, including the nature and behavior of light, sources and uses of light, types of lenses, the vibration and travel of sound, and the characteristics of sound. Various activities, such as experiments, puzzles, and review questions help students effectively learn the principles presented. General background information, suggested activities, questions for discussion, and answers are included. Encourage students to keep completed pages in a folder or notebook for reference and review.