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Use Your Phone To Check If Your Sunglasses Are Polarized

Nov 28, 2019

In the hot sun, a pair of beautiful and practical sunglasses is not only a “dressing artifact”, but also protects our eyes from strong light. Recently, there is a saying on the Internet that you can test whether your sunglasses are polarized with a mobile phone. Is it really so amazing? Look at the experiment.


Usual sunglasses can be divided into ordinary sunglasses and polarized sunglasses. In addition to being able to protect against ultraviolet rays and reduce the intensity of light like ordinary sunglasses, polarized sunglasses can block glare caused by scattering, inflection, and reflection due to their polarizing properties. We collected several different sunglasses and took them to a professional institution for testing.


First of all, we use a polarized test card to test whether these pairs of sunglasses are polarized. Through polarized sunglasses, we can see that this polarized test card will turn red. If it is not a polarizer, it will not change color.


According to the Internet, we found a picture on a mobile phone, brought two ordinary sunglasses close to the picture, observed the picture through the lens, and found that the brightness of the phone picture would not change when the sunglasses were rotated. Next, we brought the two polarized sunglasses closer to the picture. In the same way, we found that when we rotate the sunglasses, we can see the effect of flickering.


Through our experiment just now, we can make a preliminary judgment on whether it is a polarizer through the online method. The horizontal direction will be a bit brighter, and the oblique angle will appear darker. Finally, it is suddenly bright and dark. If it is not a polarizer, there is basically no contrast between this light and dark. The principle of a polarizer is simply the principle of a blind. It transmits a part of the light through the blind, and other clutters are filtered out.


Professionals recommend that you always choose qualified products when purchasing sunglasses, such as polarized sunglasses when skiing, cycling and fishing. For those traveling by car, we must pay attention to the problem.


Many cars now also have polarized film layers. If you wear polarized sunglasses at this time, a rainbow effect may appear, which is a colorful feeling. In this case, you will feel dizzy after wearing it for a long time and it will be difficult to see things. Under normal circumstances, if the car is better, you don't need to wear (polarized) sunglasses in the car. If there is no polarizing film on the car, it is still necessary to wear a pair of driver's polarized sunglasses.