000 00339nam a2200157Ia 4500
100 _aKhurana, A K
080 _a617.755
526 _dNTB
526 _aUG
366 _f#REF!
942 _cBK
245 _aTheory and practice of optics and refraction 4th ed
260 _aElsevier
_bNew Delhi
_c2018
300 _axi,526
546 _aE
999 _c57606
_d57606