Refraction
Light Sound and Waves
Reappearing Coin
At home for 5-11 11-14
- Level Elementary
What you need
- Coin
- Mug
- Jug of water
- Blu Tack
- A friend
Instructions
- Stick the coin to the bottom of the empty mug
- Step back, or move your head, until you can no longer see the coin in the mug
- While you stay in position, get your friend to slowly pour water into the mug
Results and Explanation
The coin reappears because the water bends, or refracts, the light travelling from the coin so that it can now reach your eye.
These experiments have not been specifically safety tested for home use but we believe them to be safe if the instructions are followed. Adult supervision or direction is recommended as appropriate. All experiments are carried out at your own risk.
