Polarization of Light

Why are polarized glasses useful?

Polarized glasses are useful when driving, sailing, skiing, or in any situation where unwanted glare is present. Glare is caused by light reflecting off a surface, such as water, a road, or snow. Such light is polarized. Navigating your way through some situations could be difficult without polarized sunglasses.

Take, for example, light reflecting off the surface of a lake. The light polarized parallel to the water’s surface is reflected with a greater intensity than that polarized perpendicular to the surface. So, sunglasses that pass vertically polarized light will reduce the glare from the water.


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