refraction
nounUK /rɪˈfræk.ʃən/
US /rɪˈfræk.ʃən/
Refraction is when light bends as it passes from one thing into another, like from air into water.
The refraction of light made the straw look bent in the glass of water.
OTHER MEANINGS
2. The ability of the eye to bend light so you can see clearly.
The eye doctor checked the refraction of her eyes to find the right glasses.
3. The change in direction of a wave, such as sound, when it passes into a different material.
Sound refraction can make voices carry strangely over a lake.
4. The process of measuring how light bends through a lens to correct vision.
He had a refraction test before getting new contact lenses.