For a thorough discussion both of the limitations of imaging -LF^u;s8&S  
optical systems in the collection of radiant energy and of the N:0mjHG  
nonimaging collectors which can be used to collect energy $WDa}~j~^  
efficiently, see W.T. Welford and R. Winston, High Collection <X:7$v6T|  
Nonimaging Optics, Academic Press (San Diego), 1989.

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