Different materials affect light's speed differently! ๐
For example, light travels fastest in
vacuum (like space), then air, followed by water, and slowest in glass! How cool is that? ๐ฅฝ
When light goes from air to water, it bends sharply, but if it goes from one type of glass to another, it bends less. ๐
This is why you might see a straw appearing broken in a glass of water: it's all about how light behaves in differing mediums!