using a circular polarizing filter

{"title":"Acrylic Frame Linear Or Circular Polarized Lens Filter For 3D Projector Use","imgUrl":"https:\/\/img.chinax.com\/nimg\/ca\/9f\/2e3a3becd46c170fd1ef2c9ae329-200x200-1.jpg","attrs":{"Model Number":"T01","Minimum Order Quantity":"1 set","Certification":"CE,ROHS, EN71 PART 1-3","Packaging Details":"1 set\/EPE package 2 sets\/box, 24 boxes\/ctn ctn size: 58*39*25cm g.w.:23.5kgs","Supply Ability":"100 sets\/day","Product name":"3D projection filters","lens":"linear or circular","Material":"glass","Thickness":"4.2\uff5e4.4mm","Shape:":"square","Usage":"3D Glasses , projections, etc"}}