Glasses small encyclopedia: what is a polarized sunglasses
Sunglasses, as everybody knows, also called the dark glasses.
Do you know what the polarized sunglasses?
Polarization is what?
What kind of is polarized sunglasses?
What is the special function?
Today small glasses, small make up to tell you, what is a polarized sunglasses.
Ray-ban sunglasses RB3449 men silver/lens dazzle colour blue 004/55 first let's look at what is the definition of a polarized?
Polarization, English name polarized light.
Also called polarized light.
Visible light is a transverse wave, the vibration direction perpendicular to the direction of propagation.
The vibration direction of natural light, in the vertical plane in the direction of propagation is arbitrary;
For polarized light, the direction of vibration in a certain moment, are limited in a particular direction.
Then let me know what is the principle of polarized sunglasses?
Polarized sunglasses can block glare of uncomfortable, at the same time can protect your eyes from uv rays.
All of this is due to metal powder filters, they can when light hits on the 'choice'.
Of polarized sunglasses can selectively absorb the sun's rays of a part of the band, because it is through the thin metal powder (
Iron, copper, nickel, etc. )
In fact, when the light on the lenses, based on the so-called 'destructive interference' process, the light is reduced.
In other words, when certain wavelengths of light (
Here refers to uva, uvb rays, and sometimes infrared)
Through the lens, the lens inside the eye direction, they will cancel each other out.
Formation of overlapping of waves is not an accidental phenomenon: a wave crest with the wave trough of near together, leads to cancel each other out.
Destructive interference phenomenon depends on the lens refraction coefficient (
The different material from the air through the light when the degree of deviation)
, also depends on the thickness of the lens.
Little change in general, the thickness of the lens, the lens refractive index was based on the differences of chemical composition and different.
Sunglasses factory ms YC9709 sunglasses C4 hawksbill/lens grey again let's have a look at what is the function of polarized sunglasses?
In life, there are too many light source will produce harmful light, especially sunlight;
The sun give off light has: visible light, infrared, ultraviolet,
Such as three.
With ultraviolet radiation to the human body of skin, eyes, etc. , cause serious damage;
Above, visible light,
310 ~ 780海里)
Is divided into UVA, UVB and UVC (
Above, green light (
Which is harmful UVA, UVB and UVC light, if long time exposure can cause damage to the body, UVB is has a serious effect on vision,
Is burned black light, most of the canthus can absorb the UVB light, so be sure to block out the light.
Polarized sunglasses because has the function of the polarization of light so that all the harmful rays of blocking off does not affect the visible light through, can truly achieve the purpose of protecting our eyes.
Polarized sunglasses in addition to the basic uv protection function, but also has anti glare, pavement reflect light, the surface scales such as light, suitable for driving, fishing, travel, daily wear.
Polarized sunglasses offers another eye protection mechanism.
The asphalt reflected light is a special polarized light.
The reflected light and the light from the sun directly or any artificial light source the light is different from the problem lies in the order.
Polarized light is made up of all in one direction vibration wave form, and the light of the general is by not directional vibration wave into the open.
It's like a group of people walk around with a group of no order with neat pace of marching soldiers, to the stark.
Generally speaking, the reflected light is the light of an orderly.
Polarized lens was especially effective in blocking the light, because its filtrability at work.
This kind of lens only let in a certain direction vibration by polarized wave, like will light 'comb'.
To the problem of road reflectors using polarized sunglasses can reduce light transmission, because it does not transfer parallel shock waves through the road.
In fact, the filter layer long molecules are oriented horizontally, can absorb horizontally polarized light.
In this way, most of the reflected light is eliminated, and the whole lighting degree did not reduce the surrounding environment.
After polarized sunglasses lenses can after the sun's rays to darken.
When lighting weakens, it became bright again.
To be able to, because of the silver halide crystals at work.
Under normal circumstances, it can keep the lens transparency.
Under the irradiation of the sunlight, the crystals of the silver, silver in YouLiZhuang inside the lens form small drupelets.
These small silver aggregation of jagged irregular mass, they cannot be transmitted light, and can only absorb light, the result has lenses darkened.
Again in the case of light from the darkness, the crystals form, the lens then return to the bright state.
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