Free 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
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).
Example Calculation
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°
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