Jello Light Pipe
Light follows the bend instead of traveling straight out.
Teaching & key ideas
What you do: Shine light into one end of a curved gelatin strip.
What students see: Light follows the bend instead of traveling straight out.
Why it works: Repeated internal reflection keeps much of the light inside.
Question to ask: Why can light follow a curve?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Why can light follow a curve?