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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?

A pencil standing in a glass of water appears bent and shifted at the surface — Photo: Meganbeckett27 · CC BY-SA 3.0 · via Wikimedia Commons

Your guess

What's your hunch — why does the straw look bent where it meets the water?

Make a guess to unlock the hints and the answer.