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MENTAL MODEL · M4756

Brewster's Angle

Brewster's Angle
TechnicalHigh supportPhysics
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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

When light is incident on a medium at a specific angle, the reflected light becomes completely polarized (retaining only one direction of vibration), and light in other directions is filtered out.

SCAFFOLDING EFFECT

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The filtering effect of perspective. When we observe the world from a specific angle (standpoint/profession), we do not see the whole picture but a single-dimensional projection after 'polarization'. Although this makes the image clearer (removing reflections), it also loses information from other dimensions.

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When natural light is incident at Brewster's angle on the interface between two media, the reflected light is completely polarized (electric field parallel to the interface), and the reflected and refracted rays are perpendicular to each other. The angle satisfies tanθ_B = n2/n1.

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/Brewster%27s_angleZH · Explicit
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