The function of the Polarized mirror is to filter the reflected light and increase the image contrast.
polarized mirrors are also effective at reducing or eliminating reflections from nonmetallic surfaces, which are typically polarized light. (Reflectances from metallic surfaces are complex, depending on incident wavelength and surface roughness.)When the conductivity of the metal is not zero and the reflection coefficient becomes complex, the phase of P and S components changes, and the reflected light becomes elliptically polarized.PL is linear deviation, so it has no effect on the reflected light of metal). By adjusting the polarizer, this part of reflection can be filtered out, thus improving the image quality of the subject and improving the clarity of the picture.For example, a polarizer can be used to reduce the reflection from the water, so that the fish can be photographed clearly.To shoot such a scene, the light source should be projected at the same Angle as the camera, and the maximum deflection Angle should be between 30 and 40 degrees.When in use, you can adjust the lens of the front group of the filter slowly, and strive to reduce the reflection of the scene surface to a minimum.In addition, polarizer can effectively improve the color saturation, improve the contrast, this is because the polarizer can absorb the fog or dust in the atmosphere reflected from all directions of stray light, so that the image taken more pure.For example, in the photography of still life of flowers, polarizer is often used to take brightly colored photos [2].It is useful in landscape photography, flower photography, and photographing certain highly reflective scenes.Polaroid lenses are used to depict clouds in landscape shots.Blue skies have a larger refractive index than light scattered by white clouds.Polarizing lenses can also make the foliage color more saturated and eliminate haze from low-angle city scenes.

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