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Sun Glasses Effect
Jan 23, 2017

Sunglasses can block the uncomfortable glare while protecting eyes from UV damage. All of this is thanks to the metal powder filters, they can be carried out at the influx of its "choice". Filters to selectively absorb the Sun's rays part band, just because it's a very fine metal powders (such as iron, copper, and nickel). In fact, when lenses are light, based on the so-called "destructive interference", the light has been reduced. That is, when certain wavelengths of light (in this case is UV-a, UV-b, sometimes red) through the lenses, in the direction of the lens inside the eye, they will cancel each other out. Formation of light overlap it is not by chance: The crest of a wave as it is close to the trough of the wave together, leads to cancel each other out. Destructive interference phenomena depends on the refractive index of the lens (light through different substances from the air deviation), depending on the thickness of the lens.