Ghatak, Ajoy creator text New Delhi MV Learning 2015 monographic x,142p.: ill 24cm(pbk) 1CD-ROM by Ajoy Ghatak Includes bibliographical references Light Experiments Optics Experiments Experiments 535.078 9788130931661 1516EN07 ENG-114621 dpl Viva/Ven DBAD/PUB 20180213110836.0