00307nam a2200133Ia 4500008004100000082000800041082001000049100001600059100002400075245002500099260001100124260002900135260000900164230118s9999||||xx |||||||||||||| ||und||  a535  bMAT/P  ab.kbmathur  bd.a.v collegekanpur 0aprinciples of optics  akanpur  bnew gopal printing press  c1962