Very common optical coatings are those that give the faint, reflected color to the lenses in cameras, binoculars, and spectacles. The thin metal layer that makes the difference between a mirror and a simple sheet of glass is an optical coating. But, optical coatings are used in many more applications-a particularly important current one being the splitting and combining of optical channels of communication that are directed through a common optical fiber. Most modern optical systems could not function without optical coatings.




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