Deals of the day- Mergers and acquisitions
(Adds O2 Czech, RWE,Vivendi )
Feb 27 (Reuters) - The following bids, mergers, acquisitions and disposals were reported by 2100 GMT on Friday:
** Nikon Corp, the 98-year-old Japanese company best known for its cameras, has agreed to buy British retinal imaging firm Optos Plc for 259.3 million pounds ($400 million) as it moves into the medical sector.
** O2 Czech Republic's board of directors agreed to spin off its telecommunications infrastructure assets into a $1.9 billion firm, the fixed and mobile service operator said.
** German utility RWE said that closure of the sale of its oil and gas unit DEA to Russian tycoon Mikhail Fridman is imminent, after a media report said the date for completion will be March 1.