00297nam a2200121Ia 4500008004100000082000800041082001000049100001700059245004500076260001400121260003100135260000900166230118s9999||||xx |||||||||||||| ||und||  a535  bACH/G  ad.pbacharya 0ageometrical optics for advanced students  anew delhi  boxford & ibh publishing co  c1970