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- they are materials that have a high tendency to do absolutely nothing .
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What makes transition lenses transition?
http://en.wikipedia.org/wiki/Photochromic_lenshotochromic lenses are lenses that darken on exposure to UV radiation. Once the UV is removed (for example by walking indoors), the lenses will gradually return to their clear state. Photochromic lenses may be made of either glass or plastic. The glass version of this type of lenses was first developed by Corning in the 1960s. More recently, plastic versions of these lenses have been commercialized. The first of these was the Photolite lens sold in the early 1980s by American Optical Corporation. The first commercially successful plastic photochromic lens was introduced by Transitions Optical in 1991.[1] The glass version of these lenses achieve their photochromic properties through the embedding of microcrystalline silver halides (usually silver chloride), or molecules in a glass substrate. Plastic photochromic lenses rely on organic photochromic molecules (for example oxazines and naphthopyrans) to achieve the reversible darkening effect. The reason these lenses darken in sunlight but not indoors under artificial light, is that room light does not contain the UV (short wavelength light) found in sunlight. Automobile windows also block UV so these lenses would darken less in a car. Lenses that darken in response to visible (rather than UV) light would avoid these issues, but they are not feasible for most applications. In order to respond to visible light, it is necessary to absorb it, thus the glass could not be made to be clear in its low-light state.
What materials change by heat?
Many materials such as plastic melt and some materials burn such as wood
What type of Materials that can be change?
What kind of materials can be charge
What materials should you avoid when working with propane?
corrosive materials
How can you define organic material from inorganic materials?
inorganic materials is non-biological materials. they are formed due to natural growth.
What are the advantages and disadvantages of Photochromic materials?
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What is Photochromic?
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Where can you buy Photochromic Paint?
You can purchase photochromic (color changing) paints at most automotive paint stores.
What exactly are photochromic lenses and why should I purchase them?
Photochromic lenses are polarized for better glare protection and also will have a very unique, colorful look to them.
What is Photochromic polymers used for?
eye glasses
What are photochromic sunglasses?
Photochromic Sunglasses are the eyeglasses that gets darken when exposed to the sun. Created by Corning in the late 1960s and popularized by Transitions in the 1990s,these are also sometimes called photochromatic. Lenses in photochromic sunglasses rely on a specific chemical reaction to UV radiation.
What does Photochromic football visors do?
they turn darker in sunlight
What are photochromic?
Photochromic Sunglasses are the eyeglasses that gets darken when exposed to the sun. Created by Corning in the late 1960s and popularized by Transitions in the 1990s,these are also sometimes called photochromatic. Lenses in photochromic sunglasses rely on a specific chemical reaction to UV radiation.
What does the term photochromic mean?
It means changing colour in resonse to light.
How do you call sunglasses lenses that turns darker in the sun and lighter in the shade?
Photochromic lenses.
What is the benefit of having photochromic lens on your sunglasses?
The advantages of having photochromic lens on your sunglasses are not only convenient (ability to go from outdoors to indoors with changing eyewear) but they enhance vision of patients with various ocular pathologies (diseases) and those who have light to moderate sensivity to light.
What is the definition photochromic?
Photochromic refers to a type of lens that darkens when exposed to UV light and clears up when not exposed. These lenses are commonly used in eyeglasses and sunglasses to provide protection from sunlight.
