00379nam a2200157Ia 450000500170000000800410001704100120005808200110007010000230008124500260010425000090013026000280013950000200016765000200018770000140020720240921120642.0240921s9999||||xx |||||||||||||| ||und||  aENGLISH  A535 M7  aVijaya Wargiya U S 2aA Text Book of Optics  a18th  c1987bS Chand,New Delhi  aSign Convension  aOpticsbPhysics  a Brij Lal