AN ACR LGT RPTS WAKE TURB FOLLOWING A B767.

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WE WERE CLRED FOR A VISUAL APCH TO RWY 24L. TWR ADVISED US WE WERE FOLLOWING A B767. WE SPOTTED HIM ON FINAL; ABEAM OUR POS. WE WERE ON DOWNWIND; OFFSET APPROX 3 MI FROM FINAL APCH COURSE. WE STARTED OUR BASE TURN WHEN THE 767 HAD PASSED BY US AT OUR 4 O'CLOCK POS. WE SLOWED TO APCH SPD AND PROCEEDED VISUALLY TO THE RWY. THE APCH WAS COMPLETELY SMOOTH AND STABLE UNTIL APPROX 50 FT AGL. WE ENCOUNTERED THE WAKE TURB WHEREIN THE ACFT BEGAN A ROLL TO THE R; APPROX 10 DEGS PER SECOND. THE CAPT EASILY CORRECTED FOR THE ROLL WITH AILERON BUT AS WE PASSED THROUGH THE VORTEX; DIFFERENT AMOUNTS OF CORRECTION WERE REQUIRED; RESULTING IN 3-4 ROLLS APPROX 5 DEGS EITHER SIDE OF VERT. THE ACFT PASSED THE AREA OF TURB; TOUCHED DOWN AND ROLLED OUT UNEVENTFULLY. DURING ONE OF THE ROLLS; THE R MAIN GEAR TOUCHED DOWN BRIEFLY; WITH LITTLE FORCE. WINGS WERE LEVELED AND BOTH MAINS; THEN NOSE GEAR; TOUCHED DOWN. DURING ONE OF THE ROLLS; I CALLED FOR A GAR; WHICH THE CAPT ELECTED NOT TO DO. DURING OUR DEBRIEF; HE STATED THAT WOULD HAVE BEEN AN OPTION. (HE FELT THAT THE MAGNITUDE OF THE ENCOUNTER DID NOT WARRANT IT.)