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A theta with a B subscript, the angle of complete polarisation.
Also known as: Brewster's angle, Polarising angle, Theta B
At the Brewster angle light reflected from a surface is completely polarised in one direction. It is why polarising sunglasses cut glare from water and roads, and why photographers rotate a polarising filter and watch a reflection vanish.
Denotes the angle of incidence at which reflected light is completely plane-polarised.
Contexts: Laboratory
Occurs where the reflected and refracted rays are perpendicular, which fixes its tangent as the ratio of the two refractive indices.
Contexts: Laboratory
Is the physical basis of polarising sunglasses and photographic polarising filters.
Contexts: Laboratory
A Greek lowercase theta — an oval crossed by a horizontal stroke — with a small capital B set below and to the right.