000 00255nam a2200121Ia 4500
008 220201s2017 xx 000 0 eng d
100 _aGhatak, Ajoy
245 0 _aOptics
250 _a6
260 _anew delhi
_bMGH
_c2017
300 _a424
942 _2ddc
999 _c64298
_d64298