# The Refractive Index of Water

1. Apr 20, 2006

### willydavidjr

Let n denote the refractive index of water. What fraction of the speed of the light in air is the speed of underwater light? Let $$\theta$$ denote the critical angle for light going from water to air. Find the value of sin $$\theta$$.

Last edited: Apr 20, 2006
2. Apr 20, 2006

### Andrew Mason

I suggest that you look up Snell's law.

AM