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The speed of light is a fundamental universal constant that marks the maximum speed at which energy and information can propagate. Its value is $299792458\frac{\mathrm{m}}{\mathrm{s}}$.

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Speed of light is in general $c/n$ where $n$ is a refractive index. But for example introducing two parallel plates with very small spatial separation will perturb the energy density of vacuum reducin …
asked May 7 by Leo Kovacic
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This question has even been publicly studied ( since such research is highly classified) there is not too much to read on the subject and it's hard to find. See https://en.m.wikipedia.org/wiki/Scharnh …
answered Jun 19 by Leo Kovacic