Mystery #3Tier 1-2light
Why does a straw look bent in a glass of water?
Put a straight straw in a glass of water and it suddenly looks snapped or bent right at the surface, even though you can feel it is perfectly straight. What is playing this trick on your eyes?
Your guess
What's your hunch about why the straw looks bent where it meets the water?
There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.
Make a guess to unlock the hints and the answer.