| http://www.w3.org/ns/prov#value | - A change in the thickness of thematerial which coats the optical glass will change the useful range of the filter centering on a new set of wavelengths.For this application, the optical substrate selected must be transmissive to the visible wavelengths of light, thus materials such as monocrystalline silicon, metals, certain plastics and ceramics are not suitable unless they are extremely thin,tra
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