1. Dab tsi yog lim?Optical filters, raws li lub npe qhia, yog lo ntsiab muag uas lim lub teeb.Kuj hu ua "polarizer", nws yog ib qho khoom siv feem ntau siv hauv kev yees duab.Nws muaj ob daim iav, nrog ib txheej ntawm kev xav los yog cov khoom zoo sib xws sandwiched ntawm lawv, thiab los ntawm tran ...
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