Hold up let me tell you why!!! The index of refraction which is also known as refractive index is defined as speed of light in a vacuum divided by the speed of light in a giver material. The formula for index of refraction is: (n = c ÷ v) This is where n represents index of refraction C which represents of light in a vacuum And V represents speed of light in a given material. So the speed and the direction of light changes when it moves from one medium to another. And the change direction is basically called refraction......
