Sujith,

Recall, s-polarized light and p-polarized light reflect differently and depend on incidence angle so you can expect some small deviations in your polarization state.  However, by using a silvered mirror in the visible range, you are doing everything you can to minimize this effect.

Good luck,

Sebastian

RCP changes to LCP on reflection at normal incidence whether the reflecting medium is metallic or dielectric. In your case (metallic reflection at an angle of incidence different from zero) the reflected beam will be in general elliptically polarized.

I recommend the reference

Swindell, William. "Handedness of polarization after metallic reflection of linearly polarized light." JOSA 61.2 (1971): 212-215.

Yes at oblique incidence  it will become more generally elliptic

In case anyone finds this thread later and is looking for an easy reference for doing the calculation, here is a link to a free online optics textbook showing the Fresnel equations for reflections from a metal surface.

http://optics.byu.edu/BYUOpticsBook_2015.pdf#page=91

Thank you for the very helpful responses.

In normal incidence, whether it is metal or dielectric there is phase difference of pi introduced between p and s components of light. There is also same amplitude (p and s) for both the components upon normal incidence. Hence RCP will become LCP and vice versa. For other angle of incidence, one has to refer to graphs from any standard book for the phase difference and amplitude difference between p and s components and the final state has to be concluded.