# Formula Polarization Brewster's Angle    Refractive index of the first medium    Refractive index of the second medium

## Brewster's Angle

Unit
If the light falls under the Brewster angle $$\varphi_{\text B}$$ on the interface of two media (e.g. between air and water), then the reflected beam is linearly polarized.

## Refractive index of the first medium

Unit
Refractive index of the medium from which the light comes.

## Refractive index of the second medium

Unit
Refractive index of the medium into which the light enters.