In an optical system, like a lens system, having at least one transition from a first medium to a second medium, a newly designed coating, for example, an anti-reflection coating is applied. The coating is composed of a number of sub-coatings (25, 30, 35, 40, 45, 50), each of which is optimized for a...http://www.google.com/patents/US6243203?utm_source=gb-gplus-sharePatent US6243203 - Optical system with anti-reflection coating
