000			00349nam a2200157Ia 4500
008			180424s9999 xx 000 0 und d
084			_a535 I1
100			_a"Ignou, "
245		0	_aOptics
250			_a\\200700ENGGPSX
260			_aIgnou
260			_b2007
260			_cNew Delhi
500			_aincludes index and biblioraphy
942			_cBK
999			_c95293 _d95293