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physical object > artifact > device > instrument > optical device > coating > anti-reflection coating

anti-reflection coating comparison table

Subject	has definition	is a kind of
coating		optical device
anti-reflection coating	Also AR coating. A layer of material of lower refractive index of just the right thickness (1/4 wave) is deposited on the optical surface to be coated. More complex coatings are possible which cover a large wavelength range.	coating

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