00711    a2200229   4500082001300000100002200013245004200035260005900077300002000136440007100156650001200227700002600239700002300265700003100288700002400319700002500343700002000368700002100388700002500409700002300434700002400457  a530bPHY  aGunasinghe, R. M.  aPhysicsbgeometrical opticsb block 1  aNugegodabThe open university of Sri Lankac1986g1986  a[v],117p.c28cm  aFoundation science leading to bachelor of science degree programme  aPHYSICS  aWikcramasinghe, I. R.  aLiyanage, L. S. G.  aTennakoone, M. M. S. G. K.  aSumanasekara, G. U.  aHettiarachchi, R. D.  aAbeydeera, D.R.  aVithanage, J. D.  aSirikanthi, W. D. M.  aAlahakoone, M. D.P  aSumanawathie, P. D.