Reflection and transmission (Fresnel equation) of polarized light are treated in many optics or electromagnetism books.
If Es and Ep is incident electric field with s-polarization and p-polarization, respectively, reflected electric field would be E′s=rsEs or E′p=rpEp, where r is reflection coefficient and ′ means reflected field.
Then electric field of any polarized light can be calculated by decomposition.
For instance, since E45∘=1√2(Ep+Es), E′45 would be 1√2(E′p+E′s)
However, how can I express electric field of reflected unpolarized light?
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