Matches in DBpedia 2014 for { ?s ?p In optics the Lagrange invariant is a measure of the light propagating through an optical system. It is defined by,where y and u are the marginal ray height and angle respectively, and ȳ and ū are the chief ray height and angle. n is the ambient refractive index. In order to reduce confusion with other quantities, the symbol Ж may be used in place of H. Ж2 is proportional to the throughput of the optical system (related to étendue).. }
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- Lagrange_invariant comment "In optics the Lagrange invariant is a measure of the light propagating through an optical system. It is defined by,where y and u are the marginal ray height and angle respectively, and ȳ and ū are the chief ray height and angle. n is the ambient refractive index. In order to reduce confusion with other quantities, the symbol Ж may be used in place of H. Ж2 is proportional to the throughput of the optical system (related to étendue).".