**Signing Up**

## Step 1: Setup

## Step 2: Experimenting

## Step 3: Calculations

Assume the index of refraction of air to be 1 or 1.003

Snell's Law: [index of refraction of air] * [sin(incidence angle)] = [INDEX OF REFRACTION OF MEDIUM] * [sin(refracted angle)]

Then calculate the mean of these index values.

Use this to determine the speed of light in the medium.

Formula: SPEED OF LIGHT IN MEDIUM = speed of light in vacuum/index of refraction of medium

And congrats! Your done!

Nice work.

If I remember correctly, the index of refraction equals the tangent of Brewsters angle.