Brewster Angle Calculator
Calculate Brewster's angle at which reflected light is fully polarized: theta_B = arctan(n2/n1).
Brewster Angle
56.31 °
Brewster Angle vs Refractive Index 1
Formula
## Brewster's Angle At Brewster's angle, reflected light is completely polarized, with the reflected and refracted rays perpendicular to each other. ### Formula **theta_B = arctan(n2 / n1)** At this angle, the reflected light contains only the s-polarization (perpendicular to the plane of incidence).
Exemplo Resolvido
Light reflecting off glass (n=1.5) from air (n=1).
- 01theta_B = arctan(n2/n1)
- 02theta_B = arctan(1.5/1)
- 03theta_B = arctan(1.5)
- 04theta_B = 56.31°
Perguntas Frequentes
What is polarized light?
Light in which the electric field oscillates in a single plane. Unpolarized light oscillates in all directions perpendicular to propagation.
Why do polarized sunglasses reduce glare?
Glare from flat surfaces (road, water) is predominantly horizontally polarized. Polarized sunglasses block horizontal polarization, reducing glare.
Is Brewster's angle used in lasers?
Yes. Brewster windows in laser tubes minimize reflection losses for one polarization, creating a linearly polarized laser beam.
Aprender