Enter the refractive index of medium 2 and the refractive index of initial medium into the Calculator. The calculator will evaluate the Brewster’s Angle.

## Brewster’s Angle Formula

BA = atan ( n2/n1)

Variables:

- BA is the Brewster’s Angle (degrees)
- n2 is the refractive index of medium 2
- n1 is the refractive index of the initial medium

To calculate Brewster’s Angle, take the inverse tangent of the refractive index of medium 2 over the refractive index of the initial medium.

## How to Calculate Brewster’s Angle?

The following steps outline how to calculate the Brewster’s Angle.

- First, determine the refractive index of medium 2.
- Next, determine the refractive index of initial medium.
- Next, gather the formula from above = BA = atan ( n2/n1).
- Finally, calculate the Brewster’s Angle.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

refractive index of medium 2 = 30

refractive index of initial medium = 40