This cheeky elf has switched around Santa’s signs, can you find a way to quickly reverse the arrows before Santa goes by?
This is a really fun way to learn about refraction. Did you know that light bends as it moves from one material to another with a different density?
A tall glass of water
Draw an arrow on a piece of paper.
Place the glass of water in front of the arrow and look at the arrow through the glass. The image should be reversed.
Why does this happen?
The light reaching your eyes coming from the arrow is refracted ( bent ) through the glass of water. The light slows down as it enters the glass and speeds up again as it leaves. The light rays cross over after they leave the glass which means you see the image in reverse.
Move the glass closer to the paper and then further away again. What happens?
Try different images and words to investigate what happens.
If you like this activity, you’ll love my other elf tricks.
Don’t forget to check out my other Christmas science experiments and investigations too!
Last Updated on December 7, 2021 by Emma Vanstone