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Anti-scratch coating is a type of protective coating or film applied to an object's surface for mitigation against scratches. Scratches are small surface-level cuts left on a surface following interaction with a sharper object. Anti-scratch coatings provide scratch resistances by containing tiny microscopic materials with scratch-resistant ...
Another type is the high-reflector coating, which can be used to produce mirrors that reflect greater than 99.99% of the light that falls on them. More complex optical coatings exhibit high reflection over some range of wavelengths, and anti-reflection over another range, allowing the production of dichroic thin-film filters.
MgF 2 coatings perform much better on higher-index glasses, especially those with index of refraction close to 1.9. MgF 2 coatings are commonly used because they are cheap and durable. When the coatings are designed for a wavelength in the middle of the visible band, they give reasonably good anti-reflection over the entire band.
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Anti-reflective coatings help to make the eye behind the lens more visible. They also help lessen back reflections of the white of the eye as well as bright objects behind the eyeglasses wearer (e.g. windows, lamps). Such a reduction of back reflections increases the apparent contrast of surroundings.
In November 1914, the British Government invited Dr. Camille Dreyfus to come to England to manufacture acetate dope, and the "British Cellulose and Chemical Manufacturing Co" was set up. In 1917, after the United States had entered the war, the U.S. War Department invited Dr. Dreyfus to establish a similar factory in the U.S. Both operations ...