000 00295nam a2200121 4500
008 160616s 000 0
245 _aGeometrical optics
100 _aWelford, W.T.
440 _aUndergraduate textbooks in physics
500 _aC5 K2
942 _cBK
_2BK8989
080 _a535.533 WEL
999 _c8989
_d8989