How do I grow an LVM Physical Volume on a partition after resizing the disk?

Issue

• I have resized a disk but my LVM Physical Volume is still at the same old size.

• The following disk was resized from 50Gb to 120Gb but still appears as a 50Gb PV.

  # pvs
  PV         VG         Fmt  Attr PSize  PFree 
  /dev/sdb1  VolGroup02 lvm2 a--  50.00g  2.00g