How to identify polarized lenses

Polarized lenses are lenses that only allow light of a certain polarization direction in natural light to pass through. We all know that light propagates in a straight line, which is the particle nature of light; at the same time, light also propagates in the form of waves, which is the wave nature of light, so light is also called light wave. Light waves have vibrations in all directions, and polarizers take advantage of this volatility of light.

The core of the polarizer is the polarizing film. The polarizing film has a dichroic transparent film, which allows the light in the direction parallel to the transmission axis to pass through, while the light perpendicular to this direction is absorbed. This phenomenon is called the polarization of light. change. The light passing through is the light in the same vibration direction, which is called polarized light. The reflected light is absorbed because the light becomes perpendicular to the transmission axis of the polarizing film after reflection. Polarizers use this principle to effectively eliminate strong reflected light and scattered light, making the light soft, so that people can see the scenery naturally and clearly. Polarizers can also effectively absorb 99% of UVA and UVB, protecting the eyes well. It is the first choice for driving, fishing, skiing, traveling, etc.

But a polarizer is not a see-through mirror. When you buy a polarizer, there will be a test piece with some pictures in it, and you can see it as long as you wear the polarizer. In fact, this test piece is specially made. It uses the principle of polarized light so that the polarizer can see the parallel light emitted by the picture inside, so that you can see the picture hidden inside. It is not a perspective, it is just a test to see if it is a real polarizer. Methods. Now some manufacturers have produced mahjong tiles with the principle of polarized light, with images of parallel light embedded behind the tiles, as long as you wear polarizers, you can know what tiles are from the back of the tiles!

How to identify polarized lenses?

Here are a few simple and feasible methods:

1. Under normal circumstances, polarized sunglasses have obvious polarized lens material electrostatic labels on the lenses, or indicate polarized lenses on the product tag.

2. When purchasing polarized sunglasses, you can use a polarized test piece for testing. Part of the pattern on the test piece cannot be recognized by the naked eye, but can be clearly recognized through polarized lenses.

3. According to the display principle of the LCD screen, when the LCD screen of the mobile phone is observed through the polarized lens, when the screen is rotated, the screen will also turn into a black screen with the rotation, because the polarizer filters the light from a single direction of the screen. .