Science Experiments
The Magic laser-bending water waterfall experiment
Create a glowing, curved stream of water that traps and guides a laser beam using total internal reflection.
Grab 1–2 things 45 min Ages 7–12 years 1–2 players Indoor
Fine motor precisionScientific observationUnderstanding of opticsHypothesis testing
Unlock this activity
Sign in to use one of your 3 free weekly unlocks.
Learning benefits
- 💡 This activity teaches children about the physics of light, specifically 'total internal reflection,' which is the foundation of fiber optic communications. It encourages critical thinking, spatial reasoning, and fine motor skills through delicate alignment of the light source and water stream.
Safety notes
- ⚠️ Adult supervision is required when using the laser pointer. Instruct children never to look directly into the laser beam or point it at anyone's eyes. Wipe up any spilled water immediately from the floor to prevent slipping hazards.
Cleanup
- 🧹 Pour the water from the catch basin and bottle down the sink drain. Remove the tape from the bottle and place the bottle in the recycling bin. Dry the laser pointer, books, and working surface thoroughly with a soft cotton towel.