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How To Make Smartphone Projector from Foam and magnifying glass

DIY - Make a Smartphone Projector simple at home from Foam and 2* Concavo Convex Lens
- I use 2* Concavo Convex Lens, 4.0 and 3.5, And foam
.......  -family: Roboto, arial, sans-serif; font-size: 13px; line-height: 17px;">- Thanks for watching, Have a great day !   
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