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Abstract

Reflector having a composite reflectivity-enhancing layer as reflecting surface layer on a reflector body where the composite layer has an outer layer facing the radiation to be reflected, the HI-layer, with a refractive index n.sub.2, and, between the reflector body and the outer layer, an LI-layer with a refractive index n.sub.1 which is smaller than n.sub.2 and the LI and HI layers are .lambda./4 layers. The HI layer is a sol-gel layer and the optical layer thickness d.sub.opt,1 of the LI layer and d.sub.opt,2 of the HI layer are such that d.sub.opt,i =d.sub.i.n.sub.i =l.sub.i..lambda./4.+-.20 nm, i=1 or 2 where d.sub.1 represents the thickness of the LI layer in nm, d.sub.2 the thickness of the HI layer in nm, .lambda. the average wavelength in nm of the light striking the reflector surface and l.sub.1, l.sub.2 are uneven natural numbers. The LI layer is a barrier layer of aluminium oxide made by anodizing, or a sol-gel layer.

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