00306nam a2200121Ia 4500008004100000100003400041245003000075250001200105260003100117650001200148942000700160999001700167190216s9999||||xx |||||||||||||| ||und||  aSingh. S.P & Agarwal. J.P 0aOptics And Atomic Physics  a5th Ed.  bPragathi   Prakashanc1972  aPhysics  cBK  c33274d33274