Refractive Index This is a measure of how much light

slows down when it goes though a particular medium.

Symbol n n (vacuum) = 1

n (medium) = c (speed of light in vacuum)v (speed of light in medium)

Examples of refractive index:

Try these:

Snell’s Law When a light ray travels into a denser medium, it slows

down and bends towards the nornal. When it moves into a less dense medium, it speeds up and bends away from the normal.

Snell’s Law