Light leakage of crossed polarizers at oblique view

7 Light leakage of crossed polarizers at oblique view 

As a quick verification, under normal view 6k = 0°), the effective polarizer angle p equals to 90°, which is identical to the absorption axes angle in the jcy plane, i.e. p2- p = 90°. 

To find the tendency of q when the azimuthal angle po (= pj changes, let us take the first-order derivative of p with respect to (pk and obtain 

Apparently, when (pk = (po = 0°, 90°, 180°, and 270° the effective polarizer angle (p reaches extrema. The second-order derivative 

However, under obhque view from the lower bisector direction (po = 270°, the effective absorption axis positions of both polarizer and analyzer move toward the horizontal reference. 

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