In several places I've seen a derivation of the radius of a black hole by simply determining when the Newtonian escape velocity will reach c. Similar analogies are commonly used to explain light being bent by a gravitational field.(adsbygoogle = window.adsbygoogle || []).push({});

So will treating light as a particle traveling at speed c in a Newtonian universe actually give correct geodesics or is this just a +/- order of magnitude approximation only useful for explaining the concepts without going into tensor calculus?

Dustin

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# Equation for path of light in GR

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