The last word | New Scientist

Reflective mood

The lenses of my new glasses have an anti-reflective coating. What material is used for the coating and how does it work? Why does it have a green tint when viewed obliquely, and is the coating similar to the coating used on photographic optics that appear blue?

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• Optical materials are characterised by their refractive index n, which is the factor by which light slows down as it travels through the material. A typical glass has a refractive index of 1.5. And whenever light travels from one material to another of different index, some of it is reflected.…

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