00258nam a22001097a 4500003000400000008004100004082001400045100001400059245003600073260003100109300000800140OSt240804b        |||||||| |||| 00| 0 eng d  a535bY12T  aYadav, A.  aTeach yourself physics : optics  aPatnabBharti Bhawanc1995  a169