Jello Light Pipe

Light follows the bend instead of traveling straight out. Ask students to predict what will happen. Shine light into one end of a curved gelatin strip. Key idea: Repeated internal reflection keeps much of the light inside. Ask: Why can light follow a curve? Safety and cleanup: LED only; tray for gelatin. https://www.google.com/search?q=%22Jello%20Light%20Pipe%22%20science%20demonstration%20experiment