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Google Cardboard, 3D VR Headsets DIY Virtual Reality box Glasses with Clear Optical Lens and Comfortable Head Strap for All 4-6 Inch Smartphones (VR2.0 Yellow, 1Pack) : Amazon.co.uk: Electronics & Photo
What are the lens dimensions for Google Cardboard? Does it need to be biconvex? Is 40mm (25 optic power) the best focal length? What should be its size/diameter? - Quora
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