Now insert between them a third linear polarizer with its transmission axis at 21° w.r.t. the positive x-axis.
Illuminate the train of polarizers with a beam irradiance of 500 W/m2. The beam illuminates the 0° polarizer first.
What irradiance emerges when the middle polarizer is in place? W/m2
What is the emerging polarization? Vertical Horizontal 55° w.r.t. the positive x-axis 21° w.r.t. the positive x-axis The emerging irradiance is zero - there is no polarization.
Now remove the middle polarizer. What irradiance emerges? W/m2
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