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We show that when natural light is incident to a linear lossless polarizing element, the polarized intensity in transmission equals the polarized reflected intensity. The result appears to be quite general, and is not restricted to cases where the reflected and transmitted light are orthogonally polarized. We discuss some simple examples and give supporting experimental evidence, where the polarizing element is a structurally chiral film. Leading in to our main results we review, for undergraduates and teachers of polarization optics, the theory of Stokes parameters and the theory of propagation in structurally chiral media. Our main result will also be of interest to specialists.
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McCall et al. (2009) studied this question.
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