3 ms·
Don't worry, it's a click-bait term for being invisible to low-frequency wavelengths, so not visible light. The US military has been working on microwave-invis
by SamUK96 9y ago
Don't worry, it's a click-bait term for being invisible to low-frequency wavelengths, so not visible light.
The US military has been working on microwave-invisible materials for a while and they've gotten very close. But microwaves have wavelengths on the order of a few cm (10^-2), meanwhile visible light is on ther order of 100's on nm (10^-7).
As the wavelength gets shorter it gets much harder to make "negative-refractive-index" materials - the material that enables to bend light around an object.