000 00242nam a2200097Ia 4500
008 140917b1992 xxu||||| |||| 00| 0 eng d
082 _a530 gha
100 _aGhatak, Ajoy
245 _aOptics
260 _aNew Delhi :
_bTata Mcgraw Hill,
_c1992
999 _c176708
_d176708