Polarization by half-silvered mirror?

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SUMMARY

The discussion centers on the polarization of light when interacting with a half-silvered mirror, particularly in the context of interferometry. It is established that the reflected and transmitted beams do not exhibit different polarizations under typical conditions. However, when light strikes the glass at the Brewster angle, a notable difference in polarization states occurs, with the reflected light showing a different degree of polarization compared to the incident light, unless the incident light is fully plane polarized. The transmitted light retains the same polarization as the incident light.

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nickyrtr
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When light is partially reflected by a half-silvered mirror, as in an interferometer, do the reflected and transmitted beams have different polarizations? Is this answer the same for all half-silvered mirrors, or does it depend on the metal coating used and/or the optical properties of the transparent substrate?
 
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It depends on the details, but probably not- the beams will not be polarized differently. If the light is incident onto glass at the Brewster angle, OTOH, there will be a difference in polarization states of the two beams.
 
The reflected light will have a different degree of polarization than the incident light unless the incident light is 100% plane polarized either in or perpendicular to the scattering plane. The transmitted light will have the same polarization as the incident light.
 

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