Hello, while making my tea and watching the spoon inside the glass (with water), I start questioning myself what really is refraction. On class they just told me refraction is because light goes slower in a medium, so it bends according to Snell's Law. What is Snell's Law? Light bends to a certain angle when it goes change to a different refractive index medium, so it goes slower and therefore bends. This is pretty much a 'chicken or the egg paradox' for me. So why does light bends when it goes to a different refractive index. Why does the slower velocity cause it to bend? Thanks, Sakha.