The polarization of light is needed to study the optical properties of various substances.
This can be useful in everyday life - for example, by using the polarization of light can distinguish natural honey from a fake.
This phenomenon is also used as a stereo and stereoscopic. Polarized glasses are used by drivers of vehicles and polar explorers.
To study the polarization can be done a few experiments - for example, a physics lesson.
You will need
- 2 polarization filter
- Board of polished black wood or ebony
- Light source
- White paper
Put together two polarizing filters. Direct them to the source Sveta. In this test, it should be a lamp or a screen, but not the sun. Begin to rotate one filter relative to the other, looking through them at the source Sveta. At the same time you will see how the image reaches full brightness, then fading to near extinction. Full brightness observed when the polarization axis Sveta match. It is a minimum when the polarization axis perpendicular to each other.
Put on the table a sheet of white paper. Point filters stacked together in the sun so that the shadow of the filter lay on the sheet. Watch for the shade change of the optical transparency in the structure depending on the position occupied by the filter relative to one another. As in the first case, the transparency will be maximum at the coincidence of the axes of polarization and a minimum when they are perpendicular.
Take one of the filters. Repeat both previous experience with one filter. Make sure that, regardless of its position, its transparency is not changed.
Take a plate of polished wood or hard rubber. Position it so that its surface to observe the reflection from source Sveta - For example, from the sun. Take 1 polarizing filter. Consider reflected through it. Turn the filter, observe the changes in the brightness of the reflection. This experiment shows that a dielectric mirror, in this case zapolirovat hard rubber or wood sheet polarizes the light, and the polarization axis lies in the mirror plane. With a metal mirror of this experiment fail.
The source Sveta Apply evenly lit with white light of the TV screen or monitor. between source Sveta and a polarizing filter make the strip ofPlexiglas and watching her through a polarizing filter, start flexing her in different directions. This watch is in the thick Plexiglas appear colored lines and streaks. So load transparent dielectric materials acquire properties to change the polarization axis passing through them Sveta. This experience is used in designing components for the study of mechanisms of deformation under load. .