arranged + –– +

Introduced: September 1968

Last revised: January 2006

Full Title

Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – > having four components only > arranged + –– +

Classification Context

Section:: PHYSICS
Class:: OPTICS
Subclass:: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

6 direct subcodes

Child Classifications

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G02B 9/38 both – components being meniscus
G02B 9/44 both – components being biconcave
G02B 9/5 both + components being meniscus
G02B 9/52 the rear + component being compound
G02B 9/54 the front + component being compound
G02B 9/56 all components being simple lenses