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"Wiffract" Wi-Fi method can read letters through walls
(www.techspot.com)
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this post was submitted on 16 Sep 2023
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Privacy
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It’s all about the size. You can’t use an optical microscope to look at details smaller than the wavelength of visible light. You need an electron microscope for that. Similarly, a wifi camera can’t see details smaller that the wavelength.
If you made a camera that can see in 100 MHz radio waves, you could probably see mountains, rivers and houses, but anything smaller than 3 m would be nothing but blur.