000 00275nam a2200109Ia 4500
100 _aAgarwal Lalit p.
942 _cBK
245 _aPrinciples of optics and refraction
260 _aC B S Publishers & Distributors, New Delhi
_c1985
082 _a535.2 Aga
300 _aP.x. 274
999 _c22087
_d22087