On the market there are many polarized sunglasses from various brands. This special lens design is helpful during some outdoor activities on a sunny day. For example, fishing on water can be difficulty if the fisherman has no additional protection from the dazzling water. In this case, polarized sunglasses are the most convenient solution. They can effectively reduce glare from the water.
The basic principle is that the light reflected from water becomes polarized. Polarized light rays are more horizontal than vertical. This feature is bothersome that it always causes glare. Polarized sunglasses aim to offset this negative polarization by the water surface. This article shows the ways to check a polarized lens and how to understand polarization.
There is a simple physics lesson about polarization. Rays of light can be simply represented as a wave. A piece of paper can be used to simulate such a wave. First draw a letter U on the paper and then touch another letter U upside down. After enough repetition, a wave can be formed. Of course, this wave is not as exact as a perfect sine wave generated by a computer.
Polarization can be simply simulated by holding the paper in different directions. The wave runs horizontally across the page from right to left. If the paper lies on a table, it peaks and troughs are horizontal. But if the paper is held vertically, the peaks and troughs become vertical. This is simply the effect of polarization. Polarized sunglasses just take use of this principle. A sunglass lens only allows vertical light rays to pass through. In this way, glare can be significantly reduced.
There is also a simply way to check a polarized lens. A wearer can hold the sunglasses and look at the sky through one lens. He should keep 90 degrees away from the sun. And then rotate the lens through 90 degrees, in which process careful watching is needed. A truly polarized lens would reflect the change of the sky.