Today in class we started reviewing what reflection is. After reviewing we moved to learning about refraction. Refraction is the change in wave speeds due to change in the medium. The dependent in refraction is medium. A law involving refraction in Snell's Law. Snell's Law is basically an equation... N1(sinO1)=N2(sinO2)... which we use when a light shines through objects and bends different ways. N is the index of refraction, N also equals the speed of light in a vacuum over speed of light in the medium. This is also know / written as N=C/V when we know the angle of light. A couple rules we learned for when light goes through objects are... 
When moving from slow medium to a fast medium light will bend away from the normal.
When moving a fast medium to a slow medium light will bend towards the normal. 

This is a picture of my glasses, I need glasses because instead of the focal point of light being right in the back of my eye it isn't. This causes objects further away to be blurry, I am near sighted and it sucks!