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Understanding Focal Length On Smartphone Cameras | Smartphone Domain
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What's the actual focal length on smartphones' wide angle lenses? - Quora
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![PDF] Use of a smartphone camera to determine the focal length of a thin lens by finding the transverse magnification of the virtual image of an object | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/c894983a91e1d8badea94a25e8676425e9a0f933/10-Figure1-1.png "PDF] Use of a smartphone camera to determine the focal length of a thin lens by finding the transverse magnification of the virtual image of an object | Semantic Scholar")