Polarization
Polarized light that only oscillates in a single direction transverse to its direction of propagation.
Principle of polarization of light (source: Vision Doctor).
Polarized light can be used to avoid reflections (especially with ring lighting) and to visualize structures in transparent objects. When a surface is illuminated with polarized incident light, all rays reflected by specular reflection are completely polarized. These light rays can be held back by a polarization filter arranged at right angles to this polarization direction in front of the camera. The reflections are then not visible in the camera image.
But not every surface is suitable. Materials such as wood or paper depolarize the polarized light in the event of reflections and thus reflect it back in different planes of vibration.
