00334nam a2200145Ia 4500008004000000041000800040082001100048100001600059245002300075260004000098300000800138650001300146650001100159700001800170210210b1950   xxu||||| |||| 00| 0 eng d  aeng  a534/98  aSETHI (N K)  aTextbook of optics  aDelhibPremier Publishing Co.c1950  a457  aTextbook  aoptics  aRAIZADA (S B)