Ângulo de Brewster

The Brewster Angle calculator determines the angle of incidence at which reflected light is completely polarized. This phenomenon occurs when light strikes the interface between two media with different refractive indices, and the Brewster angle is given by the formula tan θ_B = n₂/n₁, where n₁ is the refractive index of the incident medium and n₂ of the transmitted medium. The calculator uses this relationship to provide the angle in degrees.

How to use: enter the refractive indices of the two media. For example, for light passing from air (n₁ ≈ 1.0003) to glass (n₂ ≈ 1.5), the Brewster angle is approximately 56.3°. The result is useful in optics for polarizers, lasers, and reducing reflections on surfaces. The calculator can also be used to compute the critical angle if needed, though the focus is on the Brewster angle.

Precautions: ensure you use the correct refractive indices for the wavelength of light, as they vary with color. Also, the Brewster angle only applies when light travels from a lower index to a higher index medium (n₁ < n₂). Otherwise, total internal reflection may occur. The calculator assumes isotropic, non-magnetic media.