Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - (G02B15/00 takes precedence)

Child Classifications

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• G02B 9/02 having one + component only (simple lenses G02B3/00)
• G02B 9/04 having two components only
• G02B 9/12 having three components only
• G02B 9/34 having four components only
• G02B 9/60 having five components only
• G02B 9/62 having six components only
• G02B 9/64 having more than six components