000 00284nam a2200133Ia 4500
008 160122s9999 xx 000 0 und d
041 _aEnglish
100 _aSingh
245 _aOptics
250 _a1st
260 _bmeerut:Pragati Parkas
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300 _a559p.
650 _aPhysics
999 _c197
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