000			00412 a2200157 4500
041			_aEn
082			_a535.32 _bDAH
100			_aGunasinghe , R.M.
245			_aPhysics geometrical optics _bfounndation science
260			_c1986 _aNugegoda _bOpen University _g1986
300			_bill. _c29 cm. _a117 p.
650			_aPHYSICS
650			_aOPTICS
700			_aNanda , D.M. ;ed. ; Liyanage , L.S.G.
942			_cLN
999			_c37510 _d39057